Malicious PDF — malware analysis report

Static analysis result for SHA-256 003f4122899a9f8b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 15:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c804c94638762f53f8c3e0793df7922 SHA-1: 8991ed6766f55acdb8f46e4bcd7e01dd1d60db3c SHA-256: 003f4122899a9f8bebec403975dc776784248b5835525698e1ba9007cce0f024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=widget+zegara+android PDF link annotation
    • https://luatsubienhoa.com/upload/ck/files/44636467140.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/zudiwunavinonujoloj.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/63286414057.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161483cf06a332---12922376286.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/xizivusadisejemokuxuw.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/54310836269.pdfIn PDF document text
    • https://network-italia.it/file/51775500784.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/34267081584.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e70e799f---volosupazodaxamojimuwiru.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/49243089978.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/judazadowowerokesiku.pdfIn PDF document text
    • http://centronegozi.com/public/werazowebil.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/bexiruwarizizunuxumerugiz.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/refutidej.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15330574224.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dinenorafopitikumumulel.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9344640460.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/63022139268.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/34235933342.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614824eb54767---miwir.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613af435aad53---8651130588.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tosopozewozelal.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/xabemopemomagotu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/10866352790.pdfIn PDF document text
    • 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_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 16656 bytes
SHA-256: 7ab82199d2736b496bd09f32e4e25561f863c1566fa080bbb36753f5d82e5136
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 10260 bytes
SHA-256: 42bfe67c82bf4df9bb8a824160bc450d040c961ef84b213fd50e1a143cff370b