Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01643610e6c7e6b…

MALICIOUS

PDF

87.1 KB Created: 2021-06-11 11:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b7101d4cdd75a7a886ae14df5bb286a SHA-1: 6e820ed7eae205643edadf74da75128b14dde54c SHA-256: c01643610e6c7e6bf1ec9103632a292bfb53323e11f45e0ea858e465daf5a966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=mk+trilogy+apk+android PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6fd29e09c25d7f3babea8455c02ab1f2/94625797985.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/melutem.pdfIn PDF document text
    • https://service-panev.com/userfiles/22710394037.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/th8hnapor7dkpeuhfn85j8e83r/97214442696.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/vabajapujegu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7e573aad3f939dc1fab2b476b926321f/tedudutoxoxezitaragawo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a8894d2942c7591161430c09a0d050e7/70958395834.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077efec7a998---fewakonitefifekulizu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/cf7rvk14i62khcn9ghe684qidq/fovilopedo.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/bomunuwuk.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075861aeb4b8---kipetigiliziruzux.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082159d35328---6635004577.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/dopogewedunal.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8e87dd3b7730ca44a56379b6a8220d02/pugig.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/23056590281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 3880 bytes
SHA-256: f05cda1b47e533ce34de3abd5fbc21ca91df6c2dc00cc68e43e759d7d97d2b45
font_01_sfnt_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 4788 bytes
SHA-256: 01a7d860a7ee1fab51e20fdeade48b5b45512a2cd038d7e69cda28ccbc7fba7b
font_02_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 2504 bytes
SHA-256: 64320581982597c26d44cade7c012d6b7168253ca63dce8c778bf6335a4c9c3b
font_03_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 12976 bytes
SHA-256: cf12834d1f55da04d2a0ef9a13c2fa4eae858345bb44d919f2f3a7b0c45d1261
font_04_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 16120 bytes
SHA-256: 3f72182d52d723a8a6d607195b7859edecdc47646b5e224948ef8eec8a7ed20d
font_05_sfnt_off00013e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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