Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7be5f77031f14…

MALICIOUS

PDF

142.0 KB Created: 2021-06-28 16:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c30f377d337520afb5193f4bec4d150 SHA-1: 55612627dc88a209168c3107d9a589e7cdd45006 SHA-256: c4d7be5f77031f143d558dde991edc4e58694b4416b270015712a3f6f639c6b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, indicative of phishing or scam operations. The 'SE_CALLBACK_LURE' heuristic specifically identifies a callback phishing pretext, suggesting the document aims to trick the user into calling a phone number for fraudulent purposes. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8826

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dioceseofniranam.org/userfiles/file/70541406774.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tpsa9v1n7e5ki1cod47igcb9cf/43003504716.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5ea49fd52f0ef0681ab3576b2f9dec33/muzokajilugotoxele.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/dijolafasilevopax.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a52887d60a---wirokoduvuvasutusivipi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb03867b1b---4243613304.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d3b5d4c3---mugixafuvabolafatuworud.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/foxapinavuxigude.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/39201708212.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/vedepukisoxaza.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/45323026387.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/sesivibapexezusevabu.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/kakulizijuturuwumasararen.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d9a292fb---12430411035.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/26295393150.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/79f4130b260c758175659a4a9a8e7574/96525600221.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fiwetupesorativap.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cebo2o3ks75gqvb9nmagfhaa7o/40155698432.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/489af2bdfa726bc9f3bb84a1315ae195/vekumudolifazevigoje.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210617220445.pdfIn PDF document text
    • http://centrons.com/uploaded/file/195354013260d197d906a51.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b3be12df---pebividezilofuv.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ph0r2vt6dkkorbvttsckqvb8l5/76529336151.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fiposibot.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a83b036ee---57219873090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=technical+analysis+of+futures+markets+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4E8 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_01_sfnt_off0001bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBA2 1660 bytes
SHA-256: 34d899b9f9c8ea0b523fc0886b696d6f55cd3a83312b2ac1290801ec1505b895
font_02_sfnt_off0001c388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C388 11152 bytes
SHA-256: 0f7f2147cfd5b43476ee66eebab67837ca1c55b30a7a8114e2c8b1eb51eb1933
font_03_sfnt_off0001dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD6F 19280 bytes
SHA-256: 54aa4d8f9f8912c3bfdacc6466c996eefc83fcabd3803aa965af1e56498d4728
font_04_sfnt_off000210c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1