Malicious PDF — malware analysis report

Static analysis result for SHA-256 e991be11b66d6282…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 16:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e20eaff92c9c7a1dc6c2cde247274858 SHA-1: 539ab38a8b4e711afd6c7a7c21a91f9f02fc5e05 SHA-256: e991be11b66d6282ee27f773cc983fe272879f0bb219943a591053d714f65843
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The PDF structure and link farm nature suggest it's designed to evade direct analysis and distribute payloads through various compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://amandamaitland.com/images/file/45540302951.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078465a5a04b---55176115351.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7e00896c---24254672620.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/xonujamezigerigilusa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/86315f9ea7f0720343dbf08fbc4a563d/gazerawixa.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ahqnl7oefgbear77uidreisc23/6590835467.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/simeputajakifokulubulezup.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a53335b1f5f47dcb48028ad61d2bf302/fatovexegejafix.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889f401c599---42201736665.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/purivogoxal.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/81845897304.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119d88673b---gejimopujawedakexafokano.pdfIn PDF document text
    • https://baptistfriends.org/media/50725625450.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160926969b7095---zidikore.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jiv7p2o8mnq090aos85d00ks9j/xixekifefikilin.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e848fd385e---29403155836.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/kerugiju.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/453b782afe508e6df8bb8ce5ab4d9c05/99819372173.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d13a21338---36998980757.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600df88dc9---67974804806.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vomuzixibugi.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/73044789045.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/36deba3504639db1b5dbdb49e81bba9e/wulofagif.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0deaffe0858fac5dfa235b56f23de1f4/nukimamedafudejozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=peristalsis+for+kidsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 17384 bytes
SHA-256: 5d3e58a7e3c843bb01d711e22abfc5a37d211e2040f75cbc282ec47f7d3a60fb
font_01_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 10336 bytes
SHA-256: b287f24a15c4a89240a549a9077373e8189861d6ebf25b4396d91e50013899be
font_02_sfnt_off00014c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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