Malicious PDF — malware analysis report

Static analysis result for SHA-256 a029a15dafb0e634…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 00:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 815afd52cd3c50f79c2e67057b73fa85 SHA-1: 3ca7864f3f4c27f40408c0ab0bca987560851822 SHA-256: a029a15dafb0e634f8435c513f07d02d665784e93db544c869c3f4dc9cfc6d25
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The file's structure and the nature of the URLs suggest it is part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1584bb059---9806679548.pdf In PDF document text
    • http://www.smpnuenen.nl/images/files/64128146865.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/86546264726.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614655fe76f67---83344757676.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xekaxilelikepanivudaj.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/binedox.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/teroponinobasuzeb.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6600852239.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xexona.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/xaguwabojujila.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/goponeridu.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/xafebasusax.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/tagotekipodexamujadok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613313bea6768---29835238945.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/529bd73acd5516ebb799b42b1196815c/panitapukagazawegere.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/5622526827.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/90352644658.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kapusabozifixos.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6a75209b2bce1499b00f2c3b3ed3d363/44005833753.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/80321844229.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/wagiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pixel+operating+systemPDF 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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 10812 bytes
SHA-256: 736030c60b0c001eefc0d1734527b8a5d1019169d76931309bf0889353d855af
font_01_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 15532 bytes
SHA-256: 863f84cec87152ca787eb65045da8519ad379e873f52cf69d2e679437a560e96
font_02_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1