Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f769915f5b667f2…

MALICIOUS

PDF

87.1 KB Created: 2021-10-07 08:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d611909fb66f52cc9f8932e1c1177fe SHA-1: 30f7a5f45c644f2a7bd159fa5c3e9aaca582cb57 SHA-256: 7f769915f5b667f26dc26a4b72ccce2727fe548f33395e77d68f766ef974bc6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ad540c6c5c7883bb24a61ac05dd61be1/95155079620.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/64046245700.pdfIn PDF document text
    • https://fasleh.net/Files/files/balopimevufat.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1a9ba91b---42892883229.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/dobisipivoxonexumatagaf.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2d913c54---barexeveputogofumenu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/53227500504.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/58654859512.pdfIn PDF document text
    • https://pellevah.com/upload/files/lazinopilasikuwavaretadi.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/jubovit.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34687496696.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/88109955823.pdfIn PDF document text
    • http://wixoon.hu/upload/file/22530658767.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/fatutufewivone.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d03a18039e---viwemitosasorarinapopus.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c8c3215e7a284b750295ce2e0af7f149/merim.pdfIn PDF document text
    • http://yejida.com/userfiles/file/36532303498.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/72571371876.pdfIn PDF document text
    • http://bluebossa.pl/files/file/jonawob.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/37513901144.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161582ba005807---37739348981.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/liriwujalokulasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=diploma+electrical+circuits+notes+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 21212 bytes
SHA-256: 248054b31326d12d580c715707d77cfadd588e1e0b222d249b97391edc4713be
font_01_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10884 bytes
SHA-256: 25562a529c80b5f7e29844610e6769a2a5ad6817c66fc21441047c7e35784a0a
font_02_sfnt_off0001373f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1