Malicious PDF — malware analysis report

Static analysis result for SHA-256 9419669f0fd3d5fb…

MALICIOUS

PDF

102.2 KB Created: 2021-06-25 14:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 597d97d743dddd4cde9d8aa8a9d70da9 SHA-1: baf6288db51a491d57ce46efcd35a97f4609522c SHA-256: 9419669f0fd3d5fbd7885674de198cb61f13ff9ff8baa7f57d36f42ff7e74a60
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160828b7586268---retigofemo.pdf
    • https://majorsagilekvaros.hu/uploads/file/64224472704.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3f37f8b3f137c35e5f5b6751218a1c7/91484536867.pdf
    • http://machinegroup.ru/img/outer/files/fovitekiguras.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/forunula.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/doninurunavelu.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4fknqjue4hcgptp52m973ihqfv/simazesilazaburozuvad.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f3f3aa2e80fd8dc2f73057f989e68bfb/86040522112.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1f42df65---mupoxitugomun.pdf
    • http://stalmost.pl/userfiles/file/rixaton.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/87955580b34ce4d1ac8bf6e7ca888a75/65911114362.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/194089fe655e280fe4aae815214f11e0/pojapuwaz.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/bezilejusosegozaburidifo.pdf
    • https://abugfreemind.com/userfiles/file/72844231959.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/wiruferojarusazotipakewoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wrenched+meaning+in+tamil
    • 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_off00012100.bin
18f99afdee656dc94826f06619fae11288a73dd5d4c4981c30fbb25c19aca4b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 10520 bytes
font_01_sfnt_off00013871.bin
15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 1700 bytes
font_02_sfnt_off00014084.bin
b78337dee4e630db64e09d42a4752338174caf26bbe5ab5fa1ae3a263bdc26b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 19928 bytes
font_03_sfnt_off000173d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173D7 16792 bytes

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