Malicious PDF — malware analysis report

Static analysis result for SHA-256 1687f2e91561f25d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f219210619d560e13c4d0851640879e7 SHA-1: b4b1c6577c800d5f975ec0e4889f0456feaa4b83 SHA-256: 1687f2e91561f25d77ed5aaefaf3632403f65c4fc9a073be3844c6e9c162b3a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85cd246e9---saverepesape.pdf In PDF document text
    • http://18554080.com/userfiles/file/sebikawuluduniravifok.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/xufarujepofovaweg.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/bezuzifelefu.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/86967931641.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/rukizemijevixi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a3c518a7e9cf5f57ae6e76e913109d26/74107869078.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/39417843468.pdfIn PDF document text
    • http://web68s.com/upload/files/27437022244.pdfIn PDF document text
    • http://keacg.com/upload/files/32942938223.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/d63o8gtb62ir0i5p9ustdt1rl3/38197755489.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783dc55ab4f---34312529056.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/19612850842.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67e59c6c46ef1ebdf4792db86ae3fb73/mesiguvesavotiwosimig.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/wikarapukamigagoviginuvat.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e65fce22325b586dda3f5df4647dd008/22671394333.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/04ctofcln3m8uk1bahvivlig40/68858493898.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/04d6d4190803fe1f64c4ca1abf55b012/48542535975.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd916ce72---89727043949.pdfIn PDF document text
    • https://renetravel.ro/images/files/79379795639.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/volodixofaledivalazarosa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4i8n37hfjmrdko05cfbhis4hls/6053922030.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/zarev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=b+arch+question+paper+pdf+downloadPDF 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_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 11104 bytes
SHA-256: f082995834742a6013887a01b5ce60717bd38b2489014d7d8c89bdd435e97db3
font_02_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 17440 bytes
SHA-256: 2762acb176e8627484d093def42f5700e40dedaf9442e90e2fdf0f08c67901b5

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