Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f0aad133ec1327…

MALICIOUS

PDF

62.6 KB Created: 2021-06-23 14:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 64bce7ee39ea15a6e5b73d0d080011d9 SHA-1: b994c07114e03df4144edfbdf74377f6f0ac4c34 SHA-256: 16f0aad133ec1327297186700c7bdaa41aae177538986992e93431ae0797606d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting a phishing or credential harvesting attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://marljivo.hr/userfiles/file/badodefepipak.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7a85ce66f3e131d6ff7cd01381f27c8a/jafovulopi.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/35739771977.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/65125430164.pdfIn PDF document text
    • http://fedoro.ru/upload/file/62790668705.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/46766051741.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf38b802e---30441200265.pdfIn PDF document text
    • http://usmleworkout.com/files/file/pejefixi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee16932ae1---48270363479.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/737cm5nnfdk4up0q45vgqhq65d/zorujomoxafuta.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c274ef229df---60367142636.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a5c3c2989a5fddec07555bfde27a5034/kasotaji.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/56561960922.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/3f61d6c6445a452d2ef62d4ee94958a3/gufimewejux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hc+verma+physics+11+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 5540 bytes
SHA-256: 1b319c9214d70ef93ec41e4d4dc972a02f02e9d61c4c5a579ace78c7e0e496b2
font_01_sfnt_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 10388 bytes
SHA-256: 792c7e06bb2c4a07f983f3cd4adeea227bc82f027ec808cea92b6b1faf072403

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