Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f0ddb9b5f2d692…

MALICIOUS

PDF

87.4 KB Created: 2021-10-07 06:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f4601834b6f92d3d7ae7e5f2c47cc82 SHA-1: afb806e2b4fc37ebf01cd12693b2c28a666b643f SHA-256: f8f0ddb9b5f2d692a033e06114bc56bc35a299eab51cabc6cb87bbf480a1a5b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=for+unlawful+carnal+knowledge+meaning PDF link annotation
    • http://kccmaul.com/files/files/woruto.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/nugukeguzetazi.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/pigabaruwexojovuvififu.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mepamuzumiwefabaxatexavo.pdfIn PDF document text
    • https://parc-hotel.info/file/18760663572.pdfIn PDF document text
    • https://jotelek.hu/files/file/69209826966.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/47727765797.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/voside.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/zulusi.pdfIn PDF document text
    • https://mangallagn.com/images/file/68765571910.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/54444297602.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/58136488504.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/tibidivasetonax.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161544d6624e3a---2448641039.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210929132343.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/venexevakaruderipuzek.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/20217042574.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3ff54db38ce80308a48470bfd20aee55/28983724663.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddadd6e85d---tarofobezezab.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/bazezoretigakug.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/25734736964.pdfIn PDF document text
    • http://inspeq.eu/public/files/74853843528.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14c781b11---65580398668.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10808 bytes
SHA-256: fbc458a539d79b93c360702f63061b4c660972679d862d2f0d3ffe11dc902a5c
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 19120 bytes
SHA-256: a434df3c9e59f7a74add2d1e35e1dfc68cf10516b41806f4265803f702e829ea
font_02_sfnt_off00013783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1