Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f1c9e270f97d74…

MALICIOUS

PDF

90.8 KB Created: 2021-06-27 02:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ebef1d8d1a4f19052b0ea0fae2325a0 SHA-1: 8b74bb5c59f032ee788c1b7740b00c7d189acc9b SHA-256: 59f1c9e270f97d74a0600777824f2069cf48c54fb72b2b5a563d0813dbaa74ce
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbc018f52---vigebasikatur.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/xavozi.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d71a00e2e11a418d6a178d5e8963c6ea/93475110314.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnuop8qsdpahv57shlel7fruk0/15557516436.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0shj8i7nnbos1h6nvtep2vme3/vijaselomabipuz.pdf
    • http://driver-jazda.pl/upload/file/vamixamikitusarewiv.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba6da1f40---28106211207.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f3c9d1c1---roworozasigomiruzubowago.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74028a51aa---49490906645.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3743823c---53206923597.pdf
    • https://adepotcustom.com/UploadFiles/file/20210521012648188.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075dca61f028---sipopolib.pdf
    • https://cecprint.com/images/file/51583409124.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/415cdb68e9d1502cd1ef1d3d55db713f/48049328872.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f3d7a6234a2f9a89cdb19ef3e0e5b3c4/78422402706.pdf
    • http://asiancfea.org/userfiles/file/lidituzik.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5bb3f7b6---wemodulinujo.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/85491892732.pdf
    • http://deltastal.ru/userfiles/file/konelex.pdf
    • https://kopari.hu/files/file/48447728797.pdf
    • http://amoy-art.com/Upload/file/fegisepubivefobogufetoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d84dd3e5---nevujo.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/n1g4cdvrq0lquoccmqdfihmtm1/zarasubusikuretiv.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b77d1e482---50376848039.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=homeostasis+process+in+the+human+body
    • 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_off0000fef8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 16792 bytes
font_01_sfnt_off0001170f.bin
c53a70238e400eed904c5b7d309b928cf8697feb9a503f0bcad9d169e4b41846
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 11076 bytes
font_02_sfnt_off00013073.bin
f098f1f561edded04ba00db8ad309e2b9d4eed69ed76ba682d470561b21cae51
pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 17356 bytes