Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb723422374deff8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 23:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6a3ff03920334808ac73f3e6ccf533d SHA-1: a080aea551090a40e23e2df6dbb303d4d3e0853b SHA-256: eb723422374deff8ef57da428dd8ccc004272c16d3a9a486dea53902b1a05249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://asahiru-ban.com/files/files/wonuzinikam.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/72783879317.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ed5248cacf---42293872967.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/punilejubule.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/24350802014.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/p9v8mllo0pllahr22iiu9jg0km/15981227359.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4d04ab8cc172cb2fb3035a0ca1e7fb37/63260572489.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607433e09ab3a---dorefobobogi.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/052d664056f5737e5714e58a06e93099/4441479401.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/93151370862.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cc69a876---4858500794.pdfIn PDF document text
    • https://grancom.by/upload/docs/porosabiwiz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f5a0258d---33899065918.pdfIn PDF document text
    • http://rs-entp.com/upload/file/60753720244.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2987fea531ca5794c31212836e435141/ximipu.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/80929492213.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/pq8pmcbqfjcrv549u39tbn6u55/81882156658.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/83357937055.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612891f6614cd---73831729583.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///xutusodezalepumapaziza.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/30321394048.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/sjc4vde4j596vs0lcoq2stsdlt/lukitajopev.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/de67487287e0a73490e6a0b70ccb6490/58375419885.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5b07e3918b49bc7180c32bc7b5e64003/82075260627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=copper+edge+coorgPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 18640 bytes
SHA-256: 137722b55afbbbf99b0efc70c26b8f2818ed860be390ddb7a48a9268c629ce0a
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 2008 bytes
SHA-256: 85c3ddddc6d026aa0dd2a1742be550fb251a7b94ed2d09d1285587d65765b752
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 10052 bytes
SHA-256: 928ac3776bfce5a0d514f646c5fd56f2d6fbfab0f5bb535f226378f54c994262

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