Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25d3b85be1d0d05…

MALICIOUS

PDF

97.7 KB Created: 2021-07-09 05:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba8737a75375927d7d9ea60b9458c2bd SHA-1: 5f1b0a1896b0fcb771a224806da8f09901632db0 SHA-256: e25d3b85be1d0d056eacf3a23823ede0124a147c8970fbad70fb15a87231e5be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate it functions as a link farm, with some links leading to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bb4299b0614674e3c24656690db3a595/61385289983.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e57160f0987ebe4735a81a2b530346bf/wazijogamolufokaxajamozen.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c5b602c61b23855efe8abcd5e52c23eb/96014680036.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/1lr8je8l0a17vjffa7ibjncto7/20444378344.pdf
    • http://kasargod.net/uploads/file/nisevuzanuzumuxodabo.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095382d0d017---90404861243.pdf
    • https://medsplus.us/admin/images/file/xerovikemevasomatitow.pdf
    • https://dakhoathienhoa.net/images/files/26584208333.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/061ac2958f52745af98494b5176b4832/guzabow.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceedd16890---71193927998.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/91135093759.pdf
    • http://ei-windykacja.pl/upload/file/86314255884.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/404dfd384fc46f6af0a245efbac8bbc3/xukopigudovururo.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4947582b---97099278976.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec39e62683---37910808353.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5be00e4cc96f0401ee1b9f26513a2214/5259934853.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9f67c4ac---60521646087.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078017633965---rejoletine.pdf
    • http://quaint-house.com/695032449.pdf
    • https://diaochue.vn/userfiles/file/nuborofanafowaj.pdf
    • https://cristalensi.com/public/File/wadudepo.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/53456621234.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ab684087bc1---54055026201.pdf
    • https://easypayindia.in/userfiles/file/84886809753.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=birds+to+watch+for+cats
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f5a.bin
f12c0c64ba3833a84f05fc53775ba1e29d4579590f519c664bdb5a216f88ec94
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16520 bytes
font_01_sfnt_off000149ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 16792 bytes
font_02_sfnt_off00016204.bin
f644adcc398f5391edd3d3518ba5f5bcd87d22f9dd805172bea0c8ccb8bf4d00
pdf-font-stream PDF embedded font (sfnt) at offset 0x16204 10432 bytes