Malicious PDF — malware analysis report

Static analysis result for SHA-256 251469d4d1387005…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 08:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3e2bdaa0ab0c0c76b8687b5c9d154f8 SHA-1: 376c43997e5adda12f6d4fd4305a3c1648d2c8e7 SHA-256: 251469d4d13870053f69ec96dda11c43a38eae125e9857129d25f19bfc854530
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicating a phishing or malicious redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=street+view+android+app PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e9119f9bfb1fa4e90497eae0eb25eb4d/55007260017.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/95856980673.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/18043367572.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/54283431287.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/96774768487.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/bamevu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16aeaca85---3507826777.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xerapudigenilozaju.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/9835180021.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/87891683792.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/52400859566.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/lipedisubisuxiputizumiba.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nufikelaj.pdfIn PDF document text
    • http://herve-coiffure.ci/files/labatowadabawixefe.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/12336739693.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/60954646205.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/1037677662.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zofonevulofozubuxa.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f6ff930c66155b4126bceff9d0648f67/dukujesalidonifi.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/23877973649.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6468899b---28183619866.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/wakususiso.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/purotovutonotinalog.pdfIn 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://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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 10400 bytes
SHA-256: 6b1a5d49d6c70cba3baea99c7094cab005b160aa92d266efaa0128c6fe229ea5
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 17548 bytes
SHA-256: ff62fed59edf94d85f72d8c20d50605fad4c7189fe2acabbcbc4968e65316ec4