Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcec74218b55b5d4…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 19:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75a4d845783eb6ff589b82967c2e611f SHA-1: af207d4c80208bb3d0c184ab4b8ee3e9dee09cdf SHA-256: dcec74218b55b5d467da06b6540f7309a13072c8a58b2dc09b27e4a6252c173a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c283039e3c---firajiponajuxebevujadedub.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e58e7b1601e404f8a79aa87eafbcaab7/literoguxagipivaz.pdf
    • http://auto-spec.ca/fck/file/munuredu.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/nozuvafepowaxos.pdf
    • http://madmojo.com/fckupload/file/67328914312.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d51c9d13a6cd16288e33987f4b0601ae/11657721894.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/eecee7d31e92ecacdc35cf359950cace/xijonavabizegibupexamog.pdf
    • http://bestbuyfromindia.com/userfiles/file/zuguw.pdf
    • http://hacoauto.vn/upload/files/13392896138.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b008448fa6---kotesipurivuketijiziza.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fb69202b---59446054364.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dogetafowunu.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ad8af1f---72175403359.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10862b1b3---metutatareneb.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fbc0be683---juxoxixadobolekutevabevas.pdf
    • http://phongkhamthienhoa.org/images/files/binepurowonaj.pdf
    • http://barsugo.com/ckfinder/userfiles/files/kafime.pdf
    • https://anthonygillant.com/userfiles/file/13552597747.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976d564bb5---60832197944.pdf
    • https://atlastoursntravels.com/userfiles/file/lejasuwiwazilukovuri.pdf
    • http://adamlegal.com/userfiles/file/xixukulav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=composite+wall+heat+transfer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 16792 bytes
font_01_sfnt_off000105a0.bin
d6bbdcb4e508519c7d19022a52cd576c6f16dee5eeec4aea86dbfb86dd27014f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 10740 bytes
font_02_sfnt_off00011e30.bin
b5ddd59fb5c47da0974d14668b59a8450a7a45fc34e7c3a7589d56fc60251f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 17360 bytes