Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9f6b763109df0b…

MALICIOUS

PDF

101.4 KB Created: 2021-09-05 01:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a93d82ab73a67fedb82619f3cec0f0 SHA-1: 6266caf3bb4265a3917a42628f3019d2e155d79d SHA-256: ed9f6b763109df0b1564121bc35019e597dd244dfbcd775939dd86573625e86e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or link farms on disposable hosting. These elements suggest the PDF is used to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a292c9e59fe---47975437401.pdf
    • http://koszyczarek.pl/userfiles/file/67293850827.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vrvpisfvjr5k3bj1oeirelrh84/41427389919.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045bec27bf6---voludalasomojidesemari.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609305b1a0bc5---17019020862.pdf
    • http://serextion2006.com/js/upload/files/gavixuf.pdf
    • https://unicornccc.com/ckfinder/userfiles/files/lipeduruve.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/sutidagimi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a8729e66---masawezidisuranevubegibo.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/55412144345.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/b912db16f205c8ca81c912fb5782a151/fadixaxalilowuxok.pdf
    • http://seoulsquare.com/userfiles/file/6744282584.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06ef71968---63594608374.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20546409c9---10790412484.pdf
    • http://gostinica-domodedovo.ru/files/zowavefojitutaxufiku.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/32e94e882422b56b90e494be926dae29/xisizi.pdf
    • https://braintreeclinics.com/app/webroot/img/files/puravujojasajibifeleriso.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a695a940b4e---nijaluvoxisuz.pdf
    • https://parklanehotel.asia/userfiles/file/98490802826.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/de8d82e80b081ba824f5aae11c5d9f89/wijitalor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=abbreviation+pdf+book
    • 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_off000127a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 16792 bytes
font_01_sfnt_off00013fba.bin
c97571d1840edf1432811c78816f7defb4c7cffa8afc1b7007801ec3de02b2ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBA 10556 bytes
font_02_sfnt_off000157c0.bin
3d617c2b127143880c6c3a8e537bdfe244a4b44dadb7b936d36c96290d39149c
pdf-font-stream PDF embedded font (sfnt) at offset 0x157C0 18756 bytes