Malicious PDF — malware analysis report

Static analysis result for SHA-256 734829ca981c21ed…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 22:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7c2d02f895d3be51df83c8e718ab150 SHA-1: 2172359c768283789d7ed714a0b966ba2bd536d0 SHA-256: 734829ca981c21ed7414f1f02f70eb0d6ae02b5c33af1638760cf77f9bada6a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm nature is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f3e1177303---62872332367.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/86484320385.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df2ff3560---satonekezaxiluduwinesu.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/sosofuvazupat.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bef38b7c5---42899684640.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xuxop.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/nuwexijar.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4ba95172fef95784a5f4ce13ede66e49/80446743759.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a1618759664ed0a4794b995cc5c4688/tupilebaxikapepinesafo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/f0smna0v7ggd9da3uml71tgb60/20428884106.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/321365dec0ceb0aff2e3175daa39f811/73237385258.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a27079945---2842807449.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/94ab7d24080a41c2e8a661138233d4b5/xalamudume.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/lagutobalulajikunasipajow.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b424945ee47---fitedifopevofasoniwu.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/39441340395.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/34928543636.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b99191d1f57---dobekabazolorokaduz.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/feguwotijivozuvev.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/78212856147.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/19g5bl1cb9006du364jjkcgirp/19279962317.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/xiparikewigeribozek.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/xukapox.pdfIn PDF document text
    • https://capecoralliving.com/media/file/63329359614.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a024d79d---34697587249.pdfIn PDF document text
    • http://kdekdyjak.cz/data/pidotokipevubebidipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=botswana+economy+2018+pdfPDF 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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 11300 bytes
SHA-256: ae9d9f04560645a21b39b30029039d7c43c619cf280004cf914dffca883f0d3d
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 17528 bytes
SHA-256: e807243c186d561a403498dacf4d02b07c16a7b40c5852f54f27d36a49b8af37
font_02_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1