Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5a5bb1c94a13fe…

MALICIOUS

PDF

82.8 KB Created: 2021-06-28 08:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba85711ec78f62406b1b14e5e6758d8b SHA-1: dca0ec59db20cf7e479c757cd766a7670db987d1 SHA-256: cc5a5bb1c94a13fe697710811a9f5cdc4691572bf340ab3384c6c0328d6cf902
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and link farm heuristics confirms its purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c2f2817d9---6082417625.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e96cf957536292e82af220bf8ee761a1/10551508313.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31b5b144---zipasetupuf.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a9e3909e965c93f012fc2c5027878c17/lutikiw.pdf
    • http://ellev.fr/upload/files/93149630516.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa9a74e94---4373078265.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/lajofofezotixejowolazagov.pdf
    • http://unesco-mediain.cz/fckfiles/file/84797906544.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638163ed89---vazagapojelujogitowazomez.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80830e0ac---daseniwe.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/358b0b18a83c565a29f5eee7b2fafd72/37535906128.pdf
    • http://activesolutionelectric.com/images/file/texogoto.pdf
    • http://placc.info/up_image/39524665745.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608328c581660---54644511754.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad756e23a5---tebaganit.pdf
    • https://lncl.org/ckfinder/userfiles/files/bizovabategaso.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/16902636464.pdf
    • http://dailitara.lt/bites/uploads/file/66289257511.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fruiters+near+me
    • 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_off0000e1be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 16792 bytes
font_01_sfnt_off0000f9d0.bin
f79a76ad25e1a925b840bd63bafd33ad96167e148088adebbab3a4d272a91618
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 17816 bytes
font_02_sfnt_off00012811.bin
b0d81acfa5cb80dffddb31260270ad82f9698e352c32bb23ede13a493bbbc9d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 10180 bytes