Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ff1d58254daa8c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 17:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab02317a011c4ad2765cac1be7057927 SHA-1: baa7207ae763326e6c2bdb057f005abb3ccc425f SHA-256: d8ff1d58254daa8c0b6a3a0a54c6091ac340a65c994e0ede0bb4a261dd7ba44e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary attack pattern involves directing users to these external resources, which could host phishing content or facilitate further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090221849a9c---69829191684.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d759baae---45775106548.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tenowufujaw.pdfIn PDF document text
    • http://emannsltd.com/userfiles/75417061478.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127237b6f50e---rajof.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/313ef5bedf62cfbb3f88fa298c8c9cdb/guwepiz.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/wulimidoxefoloninozepak.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/84905719812.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2b7b26e0c59c8a51917466e9076ac5eb/ragupugoderupafidudugeja.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/dimesarajudinunun.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/42498277422.pdfIn PDF document text
    • https://ibextrail.com/editor-images/39161063412.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160925882c8b87---44703455485.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a687574651---90480813425.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/16743716785.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/68226236409.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d940b9b899158b8b7f79cf2256c027cb/zaxobipanera.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/10934519750.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/sg9kqm70skjvjhmjd8g6ug76ai/xuguputubexisugeremofe.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57965491893.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/warusalafunolaroxonaluv.pdfIn PDF document text
    • https://goodline.by/userfiles/file/xazataborijovudisokox.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/zofotigibimi.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nebariduxaxesalosifora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=write+all+odd+numbers+between+20+and+50PDF 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_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 11104 bytes
SHA-256: 0e7ed6b2a166750673c299b9977393237f6fe1747e259324123ad335d91c3425
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 18468 bytes
SHA-256: 0c3ff70d608b52e675606d0507bd94690bb8ae2feebdba744a6df9a993a904aa
font_02_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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