Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0409bda88c6ee31…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 09:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bdcf59c9489a5c64b6be6407b4bdd698 SHA-1: 60e6e76e1e8d45b4c0755584b5c52b89c70457a3 SHA-256: d0409bda88c6ee31723e3fd932a02920ca49053691369f3a45a24de0a94d874e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, including those hosted on compromised CMS platforms and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious content, aligning with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=kodi+apk+android PDF link annotation
    • http://aaykpn.com/uploads/editor/files/gewoduledajo.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/witofur.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/pezopuvojamugikuv.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/41491137288.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/livivebikizilos.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/29268868216.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demumavolunabolibe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324388b2f3a---86958722441.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/rulonotimiketeb.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/3827918337.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/95519679874.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2o0vq4p8l9vtlcoi6ppmk75vr4/bugexal.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/68439291439.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/66606696502.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/jixorasupunenaja.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • https://baglab.pl/galeria/file/41419505484.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/30253137208.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/66681273263.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136062d8eba7---moxibojonomufasojegirag.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/3029157475.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/wexasivexilijibekezogora.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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 19544 bytes
SHA-256: 6dc09c2b398f347b0fda51ad101ac6c742721f7ecef4308de584c5cc0f923793
font_02_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10024 bytes
SHA-256: d38aff359738425b2890ff5ac586f082df6846d27f92ddbf3d0727a890932b02