Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ed2f09d1dd01f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 16:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5291920143182363bba2e1c5c030cb84 SHA-1: 8dbb67dff45954aa87ea781754f1cfbee6b8cb66 SHA-256: a76ed2f09d1dd01f089468206f72c82890f75b8d4879d99fb696159ee3b61a76
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary function appears to be directing users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=all+element+atomic+number+pdf PDF link annotation
    • http://tekizolasyon.com/ckfinder/userfiles/files/jerararemofirakupusi.pdfIn PDF document text
    • http://www.delaneyllc.com/ckfinder/userfiles/files/18720904784.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/sofepobaj.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/faxitufufuzawuta.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/41172550821.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7aebdf7---98027388814.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab998c3da6c---wabekaf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4128bc322---28350645473.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210819161123174.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2397b45b---64806688438.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/lasamenizirado.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610997724ea2b---64703464459.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c072df39648---70764071353.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/98042216745.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/62388009716.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/54067019667.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ddb4ed820d02d022f226a0f0eaf51666/pozizisijuvijodexoladip.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1a8c8dc5---gejologikudamat.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/abd5b9d0edff8fdb1421698096644307/31743071712.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/1ecf954360bc91ff444ef3e7292b4db8/jepawebosum.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/lejuzixevavujogi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277125d7f1---fobow.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubotuditubafusuwo.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/19945572110.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/1706899259.pdfIn PDF document text
    • http://jsdarvin.com/files/30747760593.pdfIn PDF document text
    • 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_off0000cba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA0 10836 bytes
SHA-256: 6ed826be1efbaa7272494caf34681d5c7c1d191447ca6743d90d5d4eb001043d
font_01_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16132 bytes
SHA-256: bfe3a66f19f11664471f0155763bb5dac2cee6287426bf456729659573c88764
font_02_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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