Malicious PDF — malware analysis report

Static analysis result for SHA-256 4974cbcb76de3e11…

MALICIOUS

PDF

83.9 KB Created: 2021-08-03 16:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6a721ab330fb5b47264d8dd7bdc5128c SHA-1: 803848d6d5e26d3d46a16fe91fbddbe9758d0de1 SHA-256: 4974cbcb76de3e1150e16bdd3a3f41932fb1eefcd9da3bf08eeb53f80185f0e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

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://ketchas.ru/uplcv?utm_term=how+to+clean+uppababy+bassinet PDF link annotation
    • http://maility.pl/_ADRESuserfiles/file/meduwuguwamipivupaxuzorot.pdfIn PDF document text
    • http://c-amc.com/upload/files/45311612397.pdfIn PDF document text
    • http://balone.net/_upload/file///suses.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/10862687498.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1d3921c2be8492817bd45c43173e4afa/telebofaj.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1e075b5a3e8bffeecb869acead00c299/lesavetitod.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/90754541673.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/91017247403.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/11770926260.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/51b215e7db9aaa2c41efc35fe130d92d/55124889390.pdfIn PDF document text
    • http://sun-eko.eu/files/file/texofilutuvab.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b611fb5326df1a5c041f61cfe41a2368/66098838685.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bd7f8c3fc---lovejaliwudubatutuxu.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/34879408533.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071155c83fed---61451897872.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/soninepepamalorodoka.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/edvktjbasqmjgp4fmg1qq4reh8/42542378494.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/jezavupusifusulelili.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f3f2a7f5baf1672b3fc915f136fb96ff/renunerar.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2cbc63pkiqtbkq3flllr4ocfn7/nexoxu.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/66217731460.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/98ca0fb6581404480a4a3acaec0f5744/48143295578.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/47877415121.pdfIn PDF document text
    • http://sbkf.org/files/files/707611100.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0cc43e2c5c35376502474ef0f5e36db7/wobajurup.pdfIn 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://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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 16968 bytes
SHA-256: 16558998d2b9a7ca99e3f7064b8c0d49d329b443eff7cc7ae09dde8891b3f942
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 10696 bytes
SHA-256: 633e1db11eb0a78ad44472975d46623d2ceb640cecb68d5bc0f779a3ea984d06

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