Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a83563699ba54c1…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 11:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd5da7c3352ed1422ef6d9321d4be542 SHA-1: 3f9341810453ae02caf06a0b0332a0c12e0c14f9 SHA-256: 1a83563699ba54c11b416f2a1fe2234bdc8a369ba1d6f8aa3030bbdec6f68b0c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The use of compromised CMS uploads and disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bfc910898cf5b005604e034381a146e6/91106791940.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09e7c42d6---rujibopozaxakibejuve.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160952dcf73461---sujidaxefesimapamofe.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/gevuwutiwaduj.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afpbvgpp4sf4cq8k6qpp7nduau/tivadavisoxu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764ce852afc---36036002625.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/7483087302.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612afee7d5554---65412928227.pdfIn PDF document text
    • http://plncse.hu/php_data/file/57741830056.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a0d0cf94---25611694666.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/58392827958.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/19152952030.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/38202569360.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/zepubakema.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/97840494714.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/71255320564.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3kus6dq0734vk1jt2sh6grm5cn/50081922504.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dac2c81ee---98139854812.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/095fstve8cppss4307mk5tbp50/44420430582.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/ratenibub.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/matedujakedikibimuj.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c2b20c54---vakafijukekurureba.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/96412146142.pdfIn PDF document text
    • https://retta-bg.com/userfiles/tokosuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=accounting+standards+book+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_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 16864 bytes
SHA-256: c1774085ccb74b30ba7b242104b906c5f79f8de520f4a26499980f4b3985897b
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10932 bytes
SHA-256: 481a2c6721739c2795bfd324028a7ebeff4d3fd29e56b66ecb011c0911857f5a
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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