Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d97c0bccffb297c…

MALICIOUS

PDF

101.4 KB Created: 2021-07-23 08:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eeec95f85832dda0957e63f6b10a1e64 SHA-1: 3533580b9d5756e7a892e8d934f894ecbc027a95 SHA-256: 1d97c0bccffb297c3dea4f68ed00ea3d5f3929fae28f984fb72559511e4e0577
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://canoeing.by/pics/files/bogipukegoja.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/fivuvajorizikolufejej.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/rafakijobosob.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ccdug463ndfetsd2ntntct1711/5902644637.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/3951959301.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8f488b9dccd54326a24e2ecbc9f1af0c/vekiwub.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gajiro.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/41344917074.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/mumexatozulofesafubu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c657230111d---2050068135.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/29283993650.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4c28c6b6---73074150601.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/19706853980.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a926e0c7815---mudite.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ccc9bf558---rorawamitefeporejo.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/59522311568.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c06adf30---sigituruludupivogegumeza.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/47259793947.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7b18c3b3ae009b83667e26b2730e8fb7/36698740876.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/dizavurulevefuxumun.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c8c28acf0a8178925ecce403cd99f9a4/kapijazamububag.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/menefaloxogijow.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/90819508724.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/tapokanaligeg.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/porulusegite.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dbc2adbf5---refutukelurutemolinuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+idiophone+instrumentsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 10732 bytes
SHA-256: ea5c67d030ff58893f1b9cfc8adfec0e009064890d9bca09994524d45bdec94c
font_01_sfnt_off0001400f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15821 17852 bytes
SHA-256: 3c11ea1f22ec1bf8fd40b57628b00eaa75898b861eb3060bbc1a34f9cd9d2274