Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7d7ab718918771…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 18:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97e29840188a5a7854d844b165687523 SHA-1: 1b63f9413a1318e4b9cf339df6ebc8af48483a9f SHA-256: 7d7d7ab718918771d3974ce44107b8d21332d8c582d1d82eac8f0f49f32dc201
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm strategy, likely to manipulate search engine results or redirect users to malicious destinations. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5h476b02oqii77uce8kuv8lakc/99283259959.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100af67969d9---tisetefemonenolovivami.pdf
    • http://nousgarage.com/userfiles/file/80448805234.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f049e7b3b15---zefalup.pdf
    • http://kstarsmall.net/userfiles/file///luzigetuxej.pdf
    • https://larrialdiak.es/files/galeria/files/72745251196.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e862d87f---19624670799.pdf
    • http://anthonyvienna.com/sites/default/files/file/90698773551.pdf
    • http://uniquecharacters.com/upload/files/71416254294.pdf
    • http://allprintusa.com/admin/images/file/17313474146.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e3fe7bb3bef16c69e5c51b342019989b/29353089411.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/79105186235.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce87df4a92e---58982476267.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5et7lmep9jkuhek1cngd2avfk5/63997197919.pdf
    • http://vinmexindia.com/uploads/vomelupevekuzojawewo.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/werozizukizeduj.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608908684448f---dakinijorajewotadu.pdf
    • http://petra-dario.info/upload/datoteke/zigatiwivukovorusivije.pdf
    • http://sghr.ca/upload/ckfinder/files/48164018481.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fun+hard+trivia+questions+and+answers
    • 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_off0000ed95.bin
20830e883bd0d1e63e2ed852dca675e6ef79aa5e12f18c0526d97e7fb200d73d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 10672 bytes
font_01_sfnt_off000105d3.bin
fd7f61dd44f8b9cc5fb8febce3a6c3ced459bfd47c73a4ad8843467d4b9a396e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 17596 bytes
font_02_sfnt_off00013403.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 16792 bytes

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