Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11b1260a4c4e087…

MALICIOUS

PDF

81.6 KB Created: 2021-08-16 14:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0b1d64987217da7a38f518d573dccff7 SHA-1: 682a3a880584418a821b31b0879758c8e967bf65 SHA-256: f11b1260a4c4e087d5ed1f63b05141d5b272d6b4de48b0b4fffea403d649a7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://zovsh.com/Uploadfiles/files/47275626217.pdf In PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/h6lib9bi98apvs3i84de06obmi/2198708700.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/sevasufitoliterepumofavog.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/86365404221.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/17626129350.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ad9886928d3eb55051a05df5e059202f/zudinidog.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512014520587142.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074675d30d8e---30064797438.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/xivetexekupixerobu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f6f6c2c48---fajupibavifigakijowo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e8972c7919b71b32e0995ac97893f769/46684319642.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/vememovawulagajurabosa.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/87499412429.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/nosevusu.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c389eeb622ea21acb63bec564bc32776/90130020650.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f997a62583b3a55194ca3dd782e07cba/lodelimam.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8c93271b---zumuxizewumelerobizif.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/33050464227.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/mozafusidonulob.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/37811478700.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pokabatisakarejex.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/62576406889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+bread+maker+paddlePDF 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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 10564 bytes
SHA-256: 5ea0badb6fe9519b6268562f31f28133a4c359520b78b01bf16ebdd2f089d1eb
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16628 bytes
SHA-256: 7701cbdf92f4e23e5678eb77496f1ff4df4e4c246f18f63ed889c27b1c3ed0dc

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