Malicious PDF — malware analysis report

Static analysis result for SHA-256 341b01a3523f44b2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 07:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 073efa0f7c6747516f85c3510d3113a2 SHA-1: 1d6ccd24117c56fe868815bd7955b44ef04e91a7 SHA-256: 341b01a3523f44b295d9af2a48c0993a224906b2d5431d64b9511b0d871389cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document's structure suggests it is a link farm, with many URLs pointing to compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious actions like redirecting users or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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) 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 https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vvc062rpaptfgmtrff5m2iaofh/jukidejenikenus.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/38c8e5da2bdee8fb4bd1bbf383ca38f5/kuzokinijevuwabozipuzixeb.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a97cc8ccb3---jonelodebofofamuma.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/selitib.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n9fdst6142v8ujgafqh09m12so/25655136331.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xanulemutisiweket.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/jajowixa.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9169580c6---desuzol.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/belejixozegagopiw.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0242305fe---36503289911.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/51498064551.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/pupurexaxuxasezitopopuvo.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/kokupabixavolamukefiwo.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/melewuliga.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/galugitanawobemuwokevowa.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/zexiwelobuza.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/94024191743d99327dfd67f49c32cf84/38619626060.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1e277c2ba045dbbf931fe8ecdbe31eb1/61607225413.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/dimixi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d3caa7cb85343b2c940767fe66f66f29/72992707580.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/vobenegurezilamuwa.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nowakeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2+month+baby+growth+chartPDF 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_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 10600 bytes
SHA-256: 9e24e2c9a74866fecd256ea4640b5486459a18c2ab87a638d3678568b23e8a0e
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 18112 bytes
SHA-256: eeb400e404d76054a06fb75e1ff2081182334ae441511b4ee7e2dd138f2cd231

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