Malicious PDF — malware analysis report

Static analysis result for SHA-256 672efd869f0d8a06…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aaa401ff978c57ffb1addea225b06e0e SHA-1: 593889fbf5784ff16da9f604d58feaddb895d5d3 SHA-256: 672efd869f0d8a0666857e6299f3c1e87e762e1402f2602fffa4ee3d2116d7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=pathophysiology+of+benign+prostatic+hyperplasia+pdf PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b898099---76869136583.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/47651382459.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/47276412970.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/kejowiz.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/busaxedifitivitegesuf.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/kuxar.pdfIn PDF document text
    • http://apcmagon.com/userfiles/68680999765.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8249e742c---jefoporab.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afab8c80dca---simumoginipilexovot.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/77f2c8c04a648c85dae3454cf06a9d3d/potesitidipozetelikug.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e867e673d6---tekilivowu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/25337929274.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a431988506f1571008f78b17c41bb46d/rutaboxigel.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/wibuzadafevilafufafuxinon.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/34146898383.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/7100448681.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d3b5ef1c443c874d8948803311b83bc8/72013909019.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/novidirifozuviki.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7fa8535df4c6a8f570c53817d65fc7cf/27408568134.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/xijajoku.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/45495753533.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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 17460 bytes
SHA-256: 40d1af4353b382ff677ff4f0188fafa16cb91a3fae0a658759f109bc9f4e3f34
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 11156 bytes
SHA-256: 3703a91cd69ec45e24dc29ea135a575f55f9831f34195998f49e1d9359984888

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