Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f9372c69e3b270…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 01:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21b60a104a56cd9b24145d75e03ee5fc SHA-1: 2a166469508428c4c0bbcba90ff29212934dde65 SHA-256: 05f9372c69e3b27005c1fe8b39b825cffd554e2d2ebf74ea81f90c536d82cf7f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains. While no scripts were extracted, the primary attack pattern involves luring users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://leton.pl/userfiles/file/30088410283.pdf In PDF document text
    • http://unitez.net/images/newtech/files/70797071760.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372039aef67---54772338815.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/pobifufujif.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ca2cce2c---tuzotijuseke.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dafimonolinesokajoxe.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/89785101617.pdfIn PDF document text
    • https://chineseclothingonline.com/File/xedevexagetaribu.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95002257639.pdfIn PDF document text
    • http://afslab.asia/upload/files/gofolikagalijitatuluzufa.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/zufusulerefafegiratafal.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/mewipewixobegituxep.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac11d0697---55256296732.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/15652461884.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/31805295003.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/wepan.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/18280478267.pdfIn PDF document text
    • http://sushi-belovo.ru/files/lovelifaw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161307666e36e3---redatopokelozixedaze.pdfIn PDF document text
    • http://sjhtractor.com/d/files/wetew.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73010873217.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/13698343458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=roku+screen+mirroring+android+appPDF link annotation
    • 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_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 18952 bytes
SHA-256: 85f817073fc029584d4d68559a946d99ccfabd05112d7c9866b00bf17ef7bc7e
font_01_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5C 10948 bytes
SHA-256: efda3de19008656c1d8f37956482019be0b4068791278b7f5a8f0747c5fb179b