Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3186ebf3d1a30b5…

MALICIOUS

PDF

76.1 KB Created: 2021-06-10 07:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7a60c30868658f33aab69ee01e9769ea SHA-1: 261c0f37fff009ea10965844611555ceb6179008 SHA-256: c3186ebf3d1a30b57601767e7cb2d53a415fd7398ca07f23802f7507510f59a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the link farm suggest the PDF is designed to redirect users to malicious content, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://archism.ru/uplcv?utm_term=seta+alessandro+baricco+pdf+gratis PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4309c7fd---8606789855.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/20882947224.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tklk1pcfbic4pk6u33520l8fdp/tatubapijigob.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27c6d5d3f---19593850072.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/paxupedijuxe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff35136f85---63481921231.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5b2e079b67451c7d4a495d9327c7c128/36526704329.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f56927cefe4f13ca62f08635aa3f7bf4/lijafoda.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/98385293594.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f3dc8716cd04e8e0b0103ea702914be2/85997234594.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/qpc14m1b5r1peq91vv9n6vco1a/83459384605.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d91dfff3484b030600842217def36184/jatajawudotijugiditosu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6088d66d---30019578152.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b11a11763---pevekogaf.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b4ebaec1227882600845aa6e2e548a75/56060673505.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe318a997---80950119775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 5568 bytes
SHA-256: 95aa6ffa6a2f92c2acf7af2d99ba0f9dec77801dea6da0275d1b41c2cef87335
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 13904 bytes
SHA-256: 6e3a493b31951356752b866b5d256ea5abcff2258baed7dc2e7f364667acfeef