Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b815cba798dcf5…

MALICIOUS

PDF

104.5 KB Created: 2021-08-02 17:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4542807d051932c39291e2f6a41f2df7 SHA-1: de2a969ac6b4513c14bdd5eed381eca45f2f13e5 SHA-256: 95b815cba798dcf5faa5d53cf20152428aca376e3fb9eb899ec5777bbe2d57ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, suggesting it is designed to redirect users to malicious content hosted on these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c9ab9a701---34492103977.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286abd378a---45433165437.pdfIn PDF document text
    • http://laduses.nl/image/file/zewen.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/2978387981.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/vologutusowojutadifovi.pdfIn PDF document text
    • https://777mto.org/contents//files/2537366660.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/81746347489.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/40201193548.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/21fn64hva1l03f40qamn60c9vo/darelesetuled.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5a8e89edbaa48ac7101b7fa013b91073/zajuwubelarur.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210705_214838.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/05b5d739bfb50c65d960a532b4189a18/17052357475.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/c3767d578086e98ca2bda0d641c3b45d/78152517674.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/928e853ef6777270c65d6e4396cf2237/mijured.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/969744e9d01af9a7baea0e9bd1bec984/84238127480.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/81890027453.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/mebenas.pdfIn PDF document text
    • https://aashianarealty.com/file/57450589564.pdfIn PDF document text
    • http://minhanh.com/files/jipowalevekemafolejivomig.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd2c55549---xowuxarake.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e03be31452fbb65f1c82bb91399dd88f/68723183362.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160921543850da---16098867157.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160debcf37b8ba---sowegox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=animes+doblados+al+espa%C3%B1ol+latino+2020PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 19120 bytes
SHA-256: dac80bac280d8431985d0b4e2a0b2cca61ddb0e17a9e7cda66cc78354c7dfbd5
font_01_sfnt_off00014060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15871 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off00016dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD9 1888 bytes
SHA-256: 8843761473eddf0f356c70227ec74b3c55fdeb67197b19bec339d45b3f917988
font_04_sfnt_off000176a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A8 11024 bytes
SHA-256: 27610edde00836c761ac7ddd3b59d0a9657c2529dbc5ef83fc297481fdce5c90

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