Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f8bc1445ca44e…

MALICIOUS

PDF

85.1 KB Created: 2021-08-11 03:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05c2501f6ffa34b494409559c3be5eee SHA-1: e976abbda6ae33a25efd153f9e0ef7fc3c7e5b78 SHA-256: 7c4f8bc1445ca44e469a27bf5e1a7c6787f4bfe822329effa2b6f8b3a3dec2bd
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, indicating a likely phishing or malware distribution attempt. The presence of multiple external URIs and link farm heuristics strongly suggests this PDF is designed to redirect users to malicious content.

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 http://azseal.net/uploads/userfiles/file/diruzolipizot.pdf In PDF document text
    • https://liantoong.com/archive/upload/files/7113091095.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b6b5cb23---41492213427.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3a51900905975e8197e7973d33113f71/19720746007.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a16dc4c1830fc7f9c4879068e8801ac0/wazewinajidisepufofadaj.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/tovomupusodug.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969432a7c2c---denamibe.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/97370385985.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/61764449750.pdfIn PDF document text
    • http://elm3rad.com/file/50883028006.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a143d151311---vunuzoloziriwixi.pdfIn PDF document text
    • https://kede.org/userfiles/file/23215863978.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/18668531242.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/safuzanido.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4684e4a5bd0670d0489a993706efdf84/2522978241.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/filewubulasakasoferiluxa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609794201e178---fumefobalolobeveg.pdfIn PDF document text
    • http://techbis.pl/files/file/74138473735.pdfIn PDF document text
    • http://axwelindia.com/uploads/rekebuzawej.pdfIn PDF document text
    • https://sealskinz.ru/files/file/93477654135.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7irhvhgurqnvofj1rpqaka1dcj/76648692454.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3049bb6947c559930fbddf638ec0c1fc/tiladejixedosololuposutip.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/43622725382.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e15adf141f8---zoxujexajidamiduwijate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=john+deere+54+inch+mower+deck+belt+replacementPDF 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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 16988 bytes
SHA-256: ab02df6c3498d10dba4266c537669855ff50ad91212f1636dc6221fb87d4c1e7
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 11132 bytes
SHA-256: f6b87d7e7de8e6162f8410d6d252da44a6f20cc6afcd5e2caec375027e60e955