Malicious PDF — malware analysis report

Static analysis result for SHA-256 32389855f634bef0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 02:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 842e579ec9a46d5b8706cfba597645f3 SHA-1: 171da40c090a7acc64dcf5810acf0c4573a93494 SHA-256: 32389855f634bef08ca5fc03f9ace2bd2b86f90408e5482f36847c9a864fed63
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of 'callback phishing phone lure' heuristics indicates an attempt to trick users into calling a fraudulent number. While no scripts were explicitly extracted, the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=android+app+good+morning PDF link annotation
    • https://fibaquitaine.fr/cebatrama/userfiles/files/vuxiwozalivilamowanevu.pdfIn PDF document text
    • http://wwstationery.com/files/file/memanixupomiwaxobumo.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/55194457080.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9e9d7abb38c0e56ae8051eab177b8a44/41431663465.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6d40b314ee9de09b6b83ad9d5f2617e0/wesosixofekimovikedu.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/53686230299.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/13769590606.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/12121708420.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/wuvozatate.pdfIn PDF document text
    • http://signauction.net/userfiles/file/budurajufoli.pdfIn PDF document text
    • http://vhshf.de/File/janoviziko.pdfIn PDF document text
    • http://chapelguild.com/images/usr/gukapijojisaxopaziza.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56562289987.pdfIn PDF document text
    • https://kenadong.com/contents/files/bukofa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/57ab00d90725ecf3da800544555986df/35399130216.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141291ca4d17---32799360988.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/zetokimuwobizenokapav.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/dofewoge.pdfIn PDF document text
    • http://spiregene.com/image/files/20210912_132912.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/be0e7b63e5fde41f5f5f0d3647ceae45/29503852474.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/83808978170.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613613676a909---dujipes.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/wuxuvuwe.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/96315857794.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10272 bytes
SHA-256: 7214897aed7f8a7c526c88b41be26b748ec70c4753f7ecc686465a629b483cef
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 17180 bytes
SHA-256: 28fb3b2b8c1160f0947d8826fa8c006718f131e2f962a7af62f2f98b8c7a882b

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