Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceac4f9866ab7b96…

MALICIOUS

PDF

94.1 KB Created: 2021-06-25 16:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41dc84354ff2786b522bdbaf263426f6 SHA-1: fdbad518965e669582368d55f398140b773e755f SHA-256: ceac4f9866ab7b9691c3a24fdf3b2f24a7ff2e6f68a02e0973109acb83aeb9ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772f7cc0b95---76034978859.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/01c7cbf0d00f930d220eb38307150587/fibasonudomemisepukozem.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/45296109870.pdf
    • http://momsystem.ru/public/file/tokovamunupi.pdf
    • http://pphu-joanna.pl/fckpliki/file/fosifigijilosagot.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6174b0150---bobavigukufewupabonelis.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3c65e7db0095ef81356dd8b50235ecd8/18225551495.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41ba2e678---velawilufuzitinifip.pdf
    • http://cuatro-pr.org/sites/default/files/file/xamatesa.pdf
    • http://ottotech.center/userfiles/file/98010142913.pdf
    • http://gd-weimi.com/upfolder/e/files/20210528194926.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/emlq205ktvjmi77emjco6dhac7/12211547664.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67032577070.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e347cd5342d59bf22eaaed2143916913/83188425715.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c120411c682---zepefazidovetovafuxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+whip+frosting
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16792 bytes
font_01_sfnt_off00011093.bin
76a9886212d4678c38cf0096683323e6ff1c9848c6aeb3f53b72e10a260e0db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 10376 bytes
font_02_sfnt_off000127f7.bin
e09955ce4c807bc177edc3cf4accc8b2790d1ecc3d46527e4d0616b914f2fd2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 17308 bytes
font_03_sfnt_off00015537.bin
e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15537 16392 bytes

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