Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ca0416399eaf7e…

MALICIOUS

PDF

98.0 KB Created: 2021-07-21 12:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f9d7541d411bb62872b6b6119dc943c SHA-1: eb3dc17bc2b2d717d5cee1579761e2e4e8b3e549 SHA-256: a6ca0416399eaf7eeefa1d6d48623e3732cd5061d813fb3e4caa74c683bf32d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608788bf21aaa---72810102417.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/zevenus.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2613e4472---63173882574.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af0e88a5dd8---81889562217.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607602bfc16a3---17765742370.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727263b59a3---48585024027.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086947ae93e8---torametagidoleje.pdf
    • http://bakoca.hu/files/file/45979197290.pdf
    • http://giustizianuova.it/userfiles/file/1417826380.pdf
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/xapizizowipokininoxovadin.pdf
    • http://industrialdevices.in/uploads/fupowulelawuwisozese.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eca92ba4a---livudinuj.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/89214094801.pdf
    • https://footballsod.com/images/ck-uploads/files/96175328123.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/xizasil.pdf
    • http://telegid.tv/userfiles/files/giwipivanafejiluvabefuk.pdf
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/13524602328.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b9bbe935---finuludodeduzadajafuz.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a9ec2287f5fe28d7714c4c90dd8c1a15/79004428277.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fb984a2a178c4d001d665fae552734b7/gilalof.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e921110ebf---tixaz.pdf
    • http://lltsg.com/uploadfile/file///2021071222310152.pdf
    • http://sicilyontable.it/userfiles/files/xipovivururisinisifelif.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/de1c04d3be6eb8ecf931ba804ec5edbd/worixodiv.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7jk5s2jpk8cr12bsahlph2r798/15922077391.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996cbc90395---wovomewotejuwupe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=play+heart+all+i+want+to+do+is+make+love+to+you
    • 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_off00011d0b.bin
73bd0b722f576563007ea81fdfc163499fce049e6ef81f807544273ed7735e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 17436 bytes
font_01_sfnt_off000149bf.bin
b959bd9c0774bf54c13b720356aa53d5e745b2454223e54a1a8e235a9e990986
pdf-font-stream PDF embedded font (sfnt) at offset 0x149BF 10972 bytes
font_02_sfnt_off00016321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16321 16792 bytes