Malicious PDF — malware analysis report

Static analysis result for SHA-256 2160920e8fc2f166…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 22:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1732d5fe7355effb6b1ad3eef28294a2 SHA-1: a4ee000a9bd0e36b1a861ba4fb0291b5c75664f7 SHA-256: 2160920e8fc2f1668025fe36b0e0ce0559e9ca5987fc4b2923d21d7238b5598b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=roses+are+red+rymes
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed31e51e4---wufasinuwomuwas.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2cc8499a2---banubokajazejosorapigevog.pdf
    • http://riskhedgetech.com/uploaded/file/1472742693609cb7331d40d.pdf
    • http://jatyn.cn/upfiles/202105/file/1620608232.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae24656c435---89642051143.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090931796211---guruvoga.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078407d855cd---xanekonigobanidikaj.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7k4214eavrt1qmbhsvi4j1lj75/berewamoke.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/cf1c7430f8977428d47ec994539ffde1/70299608568.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0febabce1aabc7c05eb728311350cff5/24569974253.pdf
    • http://midel.me/userfiles/file/59752073143.pdf
    • https://himalayanthailand.com/image/upload/File/sikexokebelobefaxalel.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc9186b78---jepelak.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda496e363d---46855995170.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a256503195---gufusexup.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26c811f33---75634125855.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pofawosaziderovidepusolav.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748591c7abc---mamamevaxegekefewozo.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cnscah5208ig1fvvqvb6qpr8f4/ruluminirusitiv.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96702c77d---56677101964.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/cbdmprc8t8ai6a1t49ape45214/29920729068.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4o6s3d8qvhmcjh2sgv088l33am/zeletaxezazuxaliv.pdf
    • http://escqatar.com/uploads/userfiles/file/file/pokobiresuwidonuva.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38182b982f---5868253996.pdf
    • 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_off0000f79a.bin
962158b96283867b6911335ee4371b8c189e67e564857f43a8a8abe41df12050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10228 bytes
font_01_sfnt_off00010e9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 16792 bytes
font_02_sfnt_off000126af.bin
a979913e8beadf787c2f99d92fcb632233a30e9bd243589b5d98d6b3d5bde286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 17260 bytes

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