Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c41dbfab41d74db…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 752283012b38fc4b2f3a0ddd6b1e5f6d SHA-1: c947d8b4dc5c1bcc60ea158c337b3d68d41ca039 SHA-256: 0c41dbfab41d74db503f94c91699a655c762a1a3fde289c23f9910507ca60530
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, specifically a phishing or trojan delivery mechanism. The numerous embedded URLs point to various compromised websites and link farms, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings are consistent with exploiting PDF vulnerabilities or embedding malicious links to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=how+many+zeros+are+there+in+1+quadrillion PDF link annotation
    • http://hyunbulsa.org/~ewedd2/userfiles/file/29905520030.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d678bdc3d---19898853918.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/satufewumepawalena.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bibepozukatuwebulejiwinam.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407357946.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/bec8405b9bc109e0cb7b8fe8125be16f/20904944063.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nazaxodedezokole.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/31984851760.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/dabilaxakeju.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/36574433705.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/42698366909.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/35426946885.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nlbn2dq0gd00n31k5dgcjph952/wotofejufesutalirukosopit.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/93528337222.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/molasib.pdfIn PDF document text
    • http://xycrusher.com/d/files/bopodavusekanisijivazu.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/14319016256.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/76533775967.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/29167545771.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/22747817923.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sokexijasebuvoveku.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/24932892320.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/sewabuk.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/dewalex.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/44806360086.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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 11060 bytes
SHA-256: 003b7bbebe8425bf731e2bd5b2610750d5ef37bf2528ddcf4052999b97d723fc
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 17160 bytes
SHA-256: 6c491703576148dda305629248c030cc4eb0b4cad0d371551b4563057fcec9ee
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1