Malicious PDF — malware analysis report

Static analysis result for SHA-256 7399b0f2c4820959…

MALICIOUS

PDF

107.3 KB Created: 2021-09-08 09:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03ac0422666a87f01971c2255d03f84d SHA-1: 9e0ee17b652ba2897b093d0acd7e308ee35abd64 SHA-256: 7399b0f2c4820959f73daa9659427dfc74c2e764fb0321da77db6cb93c0259af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://vanvoorst.info/uploaded/file/joxofurudovoneriban.pdf In PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/ratiworowuxujo.pdfIn PDF document text
    • http://renovator.cz/files/file/suxug.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/97909231784.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160870c21d0693---43524584623.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/baec27262f1fb577ced1483fec705ef8/nedus.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11585045425.pdfIn PDF document text
    • http://ctm.it/userfiles/file/suxubupop.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/98391547611.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/376c22ff8bda1a243fb4c11b1180dc06/4434840198.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jumaximuke.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612139309a77f---mefime.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/bidolekuludujomifila.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210627030708.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/totigixibejubin.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbb6696e1---mafabosikelutenamorixu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/894b765d82340b77b27bca90ada2fb0e/40260885428.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/pazifaxepulatixolamoz.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/xugalupuk.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210804020224.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/31eeb2e4d85bb98fc2a6836fc518e1c4/gajaroko.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/96738319255.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb7c77728e---90200273306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=power+quality+notes+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_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 18264 bytes
SHA-256: d5718567042dc47fc7806a9993eaddccf770bab7bcc83e4c0dac7a71e127ca7d
font_01_sfnt_off00016e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001864c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864C 10936 bytes
SHA-256: 56cb214ba4e5515ffe1b9bd03ed407c883bd3e8d42126f6748cf15b1e987ebc0

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