Malicious PDF — malware analysis report

Static analysis result for SHA-256 6288837c116b30da…

MALICIOUS

PDF

74.0 KB Created: 2021-08-09 20:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f13a56b5d4d8293f5c9dbe4a14a30a28 SHA-1: f02e31cb27a9fa723ecdd41b975e52014c7a7de5 SHA-256: 6288837c116b30da6ab73aee33d05adb306cb2e80e619b34d447d5e4de3ccbc4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, and the document body was unreadable, but the presence of numerous links on compromised infrastructure strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160912757f1f69---65069367460.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/jinubanasezijikibuvi.pdfIn PDF document text
    • http://www.siposferenc.hu/html/30209711450.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/xinijefugulu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cd15617516a5962a716aff4f552a217f/68929448672.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/591a8494ba10a292b2ca093cdb4112bf/77853392334.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/89066580681.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/42ee46b46b2e8789727a60351500dcc9/wexedotofav.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b283e60cad60a61d6d1af4b051d8d0e5/kobobesagixapebakin.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b08879f9c---tifikogukasofemu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/35298772356.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/ratakifulesuxelepozet.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/salutiwuwexun.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/346741df2cfd3491210daa5d95f35120/wejejifaranixe.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/20923541709.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zogosoxozomibilufogomuw.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/44769470990.pdfIn PDF document text
    • http://short-story.ru/upload/file/lagusor.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/gisovewugunirobajalala.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/38226655255.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/pixuxukajamoberu.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/27252624223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=capitulo+1b+actividad+7+audio+answersPDF 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_off0000bedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDB 11032 bytes
SHA-256: c97a03e13b33c2f3c57028fea4e70e7b5ff01fe3819b7da8506cbf43dbaf4300
font_01_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 16020 bytes
SHA-256: 2b1780951dfd92ed173a076a6276db7e794858dc39591c1594e5b077275f9286
font_02_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1