Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4cc9f1e773bebb…

MALICIOUS

PDF

97.6 KB Created: 2021-07-01 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6a145f1ea5ed9858e8927858dd6b439 SHA-1: 62ee05b4713a6a89d1124ac00c091c74bed6e3c3 SHA-256: 6b4cc9f1e773bebb1bd004d64fff5f201ed5f780b461d742c1e627d5d21be089
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://netflor.pl/upload/File/pevufitobexesidodore.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f0dfe038bfebb0efaa04c9b35b3a74c/26508696122.pdf
    • http://maynenkhiinverter.com/media/ftp/file/kaniwafedofawo.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1b09849a---zijabaxuvonelubatevobaber.pdf
    • http://rydelko.pl/userfiles/file/71958070731.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2f8c6143eb86e5966d4d20247353bbac/45169989424.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//riroj.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/lafifike.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/53421724646.pdf
    • https://samarpanbharat.org/trila/userfiles/file/85689616179.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/59hgi6hi1pa3s86absoj6oh3ig/11939792164.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073adbb59fd8---69896224030.pdf
    • http://txextremecarts.com/userfiles/file/tizejiwuwikif.pdf
    • http://fujavietnam.com/images/Download/zalixirapim.pdf
    • https://ambient-interier.cz/files/files/sugisedawiz.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160daf238748d1---bikib.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vhoqo7p6jgpbo36cpnebp7eodb/67937520843.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f0e90063---37986451178.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088f945b4f5d---zunefefetolariwu.pdf
    • https://nic-irq.com/userfiles/files/gobuxubibor.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d5fad72a---xiduminoxojatarunomapev.pdf
    • http://www.elstar.ru/uploads/files/83878654198.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4b0hqa7spugmp9cdd0v693o8f3/bobapojerajidufesuw.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba7141d0eb097c0d290488d646a7b27c/gotobonazejowepuranevone.pdf
    • http://babamoleskine.com/files/file/26392879319.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f383a4039b---22541300102.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3428663004---sidowidelofunopalajewix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=friendship+boy+and+girl+quotes
    • 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_off00011c60.bin
f5415a93488057e32bd19da93fdb6531f4085221e791b3408e3e437167c84a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 16800 bytes
font_01_sfnt_off0001477e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 16792 bytes
font_02_sfnt_off00015f95.bin
ac0a936a226b9c45b8c7b90fb16f2a465f49f89dd7b8e9f759c5711351341e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F95 11148 bytes