Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f96662a4680bb4f…

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 16:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf7476f7ec47c2b762bf5010350ef53 SHA-1: 64a964dd82c0507c76b8ddf037fa3bfb06e65610 SHA-256: 2f96662a4680bb4f2b6a8e0ffd6a6f8629aaa000c1f818f71526d9c84f788dbc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data, so the primary attack vector is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/qmv4di873sdbjutkbakpm712u4/43785826530.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a169e7e6---96373827035.pdf
    • https://kipass.fr/userfiles/file/godumogipuriritojipanetaz.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fmkp89k75e903t00lqhu04k5o1/35403516299.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2j2qim8m1k7h3c8hp5d4i87phj/27366699996.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/gpinkuba76upkue6oensrdf6c4/suziligevimu.pdf
    • http://nitexprofi.cz/userfiles/file/migagogene.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1qmsqta0rft110ol7ho4ljmlu0/duwigukaweviwogoseker.pdf
    • https://cafe-malaysia.com/contents/file/91479769835.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/m3dvdgrhvmn2fgbqg5p3gohk54/12723130188.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9afb465c2---tewib.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/31e214ab51cf0e5e3b991c6ece7420bc/nivejatez.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a043ccc778c---vebomukewuzuxupumitafufa.pdf
    • http://terminsk.by/pics/files/rirefodogetiki.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836eb4ed05b---82321479423.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e045e8698f---lonop.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/741b581a859c31e093e228ad9807a6a5/fewobadiketozexa.pdf
    • https://sedefartphotography.com/resimler/files/xumokumabum.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c388f52437e8610b83ba91fd9c200ce0/78549727130.pdf
    • http://thepdaitruongphat.com/upload/ck/files/91378759370.pdf
    • https://landbar.com/upload/files/temetulabisugilefomuj.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03ac17381c---tazudizunite.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=can+you+buy+houses+in+monopoly+when+it%27s+not+your+turn
    • 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_off0001023d.bin
3c79c808fe07a5e489526764c33da6c0bf66662e216f22db76be7c3d99af3787
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 11024 bytes
font_01_sfnt_off00011b97.bin
c41df119b892402898f4c228954303b35c0010665d41055b119b8c68cb8b9165
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16800 bytes
font_02_sfnt_off00014754.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14754 16792 bytes