Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6494c09c519d6ee…

MALICIOUS

PDF

79.4 KB Created: 2021-08-25 22:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db997efb32d7ab6b696133752d95bd2 SHA-1: a222a7161922b66b8ab88d2cb8e34729599fa6cf SHA-256: d6494c09c519d6ee8f4c7f309d0fb95a1974ee5d7cf9c1cea158592a032f20e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple websites, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9767db2ed4068e12ae55e6033f302f72/dexeporasovefazawepen.pdf
    • http://accessiblevehicleservices.com/userfiles/file/pukalezuz.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe71213c73---82393184742.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f701e2c7798---99986489100.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa4aafe7e---11685305554.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/sm4utct5ip7p4k1lk7mk6h0858/tadiwitukutaxebosuw.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/0a026c93630f7e4c2f729cc5a8d96bea/84366732040.pdf
    • https://ajitcoatings.com/uploads/28475018189.pdf
    • http://nfrostov.ru/upload/files/dafetobebobizarolekubuwe.pdf
    • https://emilline.dk/ckfinder/userfiles/files/62554386859.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eae27e7563---fotosujimafagadij.pdf
    • https://fong-cai.com/upload/files/96611863580.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a635ccad5---20449700159.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/81487152198.pdf
    • http://sinsg.com/files/fckeditor/file/37824538344.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611df47f212a8---23285041210.pdf
    • http://playbabydoll.com/userfiles/file/funer.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5ffdf79d05f5b467a7a409db4f103fd7/25652317423.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fac193455e306c99f084df918a6fe62b/71129268028.pdf
    • http://narcisse.sk/editor_uploads/files/74581701036.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d78cdfe9a2d---kaxerizalifufepoxepuzule.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=linux+mint+guide+for+beginners
    • 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_off0000d6e2.bin
3a8c85eba1118e66c984d481f8b8abaac6761aca52a985e28741b568626ceea4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 15916 bytes
font_01_sfnt_off0000ffa9.bin
f0ffd69d0df8680c5aff9265bc651b21a5f1546e3c3a62029ecf93470e359628
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10788 bytes
font_02_sfnt_off0001183f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 16792 bytes