Malicious PDF — malware analysis report

Static analysis result for SHA-256 34da051a88f52ec9…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 23:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60ecb0ab5ade6411dca2a238f431f2f1 SHA-1: 60a414f9b8982a6831c7f85d292de6378d8c7ba7 SHA-256: 34da051a88f52ec91b770ca8a08bf0a55b78322a4ebf180f29e417777845fe02
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's file upload directory. These links appear to form a link farm, a common tactic for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813a4e91b4---95729073023.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b812fdbe88f---tafatuxaveduzenebi.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c3b97c3c---38738787344.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a11857c3a9d---67757051210.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/8ac3fb8360fc1cf6bb8060dad163c8b0/2920814801.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607006bc758c7---40616332033.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/65172825306.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160766603d9ef9---32027074024.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3d99fd52---63090476415.pdf
    • https://amitadevnani.com/userfiles/file/30846639115.pdf
    • https://associazionedynamica.it/uploads/file/70218122359.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/43876339946.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t050pkh4fslfe2ahua0e335h06/2374670075.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e073adf1b49e3340a6eb6c3d1070b7dd/sunufakokarobidofapino.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00e35f5b0---33313909499.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a5c6d7be47de59d20564d46bf25f4b19/97817504425.pdf
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/97988464388.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/08oh7jbq5gvv1u7vksi1mc7fr6/44338156547.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/21e60ceb21add56f5421bff6bb772fde/83075356127.pdf
    • https://maximatrimony.com/ckfinder/userfiles/files/17232522979.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b109ae429cb---zovumufixus.pdf
    • https://marljivo.hr/UserFiles/files/73149538690.pdf
    • http://agnieszkapawlik.com/userfiles/file/49495277157.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074744adcc04---27304861051.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=play+fate+grand+order+on+pc
    • 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_off0000e3f4.bin
5c81c551473f6a87ffc7b2f71d6a41c5a2600ccc7865876bba632bd361370ac8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 18400 bytes
font_01_sfnt_off000112ba.bin
564281fdf68c011db4070a1e76d5b6c13c7b390d137537ec97a3c91c2b3d0136
pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 10652 bytes
font_02_sfnt_off00012b17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 16792 bytes