Malicious PDF — malware analysis report

Static analysis result for SHA-256 184f204e763cc859…

MALICIOUS

PDF

83.8 KB Created: 2021-06-15 13:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 006e8a8665a31efb72c7af93fd721c17 SHA-1: eda4151ea2b581d86c69561c5aaec22dab83fb92 SHA-256: 184f204e763cc859dcdf551864174b4e060920f39b715a93996e06484e3ea9f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO poisoning or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. The document body, though heavily garbled, contains text related to a resume, which is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=resume+for+diploma+mechanical+engineer+fresher+in+word+format PDF link annotation
    • http://abpaluso.com/upload/file/felesubanateferamem.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097186f0174e---40288480401.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/14ed85e7b2314b1c5f4707e7c8f2eb26/74175498261.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce415325---migimurawusatapato.pdfIn PDF document text
    • https://activepymes.com/pub/file/25942915462.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5981dd7c---tukiralib.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/71470024269.pdfIn PDF document text
    • http://skncn.com/u/files/zurudufodidematuvor.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/f0ptl97esmli0rd7njeumagle8/49344811079.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072788b6f667---3007836484.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/nevipetifo.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/65393736637.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/69418379376.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h1phtpd5fb9opu90ld60q3ium3/juzafepimaxapifo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/nanijoxaramunok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 5668 bytes
SHA-256: 953cfd5128d3b477b10d6bc8f36827ceb908ef5f72415978a23676a0e5f8712f
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 11536 bytes
SHA-256: c6e7184d743b52dd6192556aa02942b0af357dcaa31a5cca9d7bb2df8e6e9c2a

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