Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ab76cadb688f3f…

MALICIOUS

PDF

80.5 KB Created: 2021-06-10 17:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c7a9af32563a066d66c44d1772e917e3 SHA-1: 673af2ef6fe960cddb31523e7090f005c835ee57 SHA-256: f5ab76cadb688f3ffc35aacddac75d6ee955416e2a3c021742618d2d6036b304
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=differentiate+between+electrolytic+cell+and+galvanic+cell PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/585692f5c6c4d980bf419980d16b5d09/80438722565.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/32fcd0cf0badfcf942dfaacba2feea3c/14195265273.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/15757175794.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c07fbba4bba---84177930790.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/juten.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/lolewamabude.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/zuzamidufelekilojixapapiw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76fc0dbc7---gozibozavumofojavozil.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/25b7002ae90a91bc4f794fd1fe6de16b/rugoxajinubefo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/11949864528.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082383340d45---nokovetozepokiv.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160801c8842510---8506587450.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6kcrcfl8dao83v1nm0thlq2dh0/telesokobevimur.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/98988419079.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/vakumejet.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b07cc3b0f---61274018637.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37dcb8eac---85853980536.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/4036189115.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_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 5404 bytes
SHA-256: c2174077e621a6052ef6e550ac13cf1af4a7617cf8235fab87ab636d9817ef02
font_01_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 10548 bytes
SHA-256: 224e5af147de094b45d65e0a42b19f4b0f7caaa24f4cd9fbb12f91cda8983cd6