Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85a3a68b812b13b…

MALICIOUS

PDF

91.1 KB Created: 2021-06-26 10:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 260f6231d0f0a6c031ec3e0465064955 SHA-1: b4ea6e60e98be0c477261cde03271fbd5939a1e8 SHA-256: a85a3a68b812b13b3ee84000e319ff72e0b705096340358c3224e22fbd90f3b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://taevlingar.se/images/pages/file/vijonebelalosekan.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f641c138b2d7b60e3b7213839056d6fa/78424088937.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc95712d---kezobusorado.pdf
    • http://guides2alpes.org/uploads/file/66856769458.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0bb102ac---kadobeso.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba026771637---puwetutijaj.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/94898f1c39f28b17dfd7c586f2903f85/40634070558.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3de83125---fusosubajigovapenawefe.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/43121590143.pdf
    • https://weeb.nu/userfiles/file/lakawasoromukonaj.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/srs36ptmr002fkbmpsnriqtutf/lupawojugat.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0kn2abj0jc7med2mmj4ue5epkb/rajekatamogizoxawuzitapum.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0gt1c0cphnmdtdvkuq76245beb/tovepubigutufajegidali.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcab60228e---nitiluwaki.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/c85ivco0eap808fda4b0u6vg82/65275191259.pdf
    • http://orchid-daikanyama.com/userfiles/file/penepogevexufoxekitusuzi.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/78ea87f1fe2737360994c30d61f34e2a/felegirixozezotomebetotat.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fefb3a28d---51151414144.pdf
    • http://aarogyamedico.com/userfiles/file/65054714471.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955f70343---59245869723.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812d0b5f306---77463436414.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/cf9bec9b2bdebaac71b0d1e10df68a98/vawaboxoragarixedonudo.pdf
    • http://www.anjhimayath.com/upload/file/kobiw.pdf
    • http://kartywspomnien.pl/uploads/assets/file/40702962841.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=3+examples+of+polymers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 16792 bytes
font_01_sfnt_off000117af.bin
95b9173a4b5ec7fd9d5fefe3f0682e79382b8a7f7cdb4ae47c8d735f43bc58b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 10516 bytes
font_02_sfnt_off00012fac.bin
54bd88e153d394527a997d2d702e1628884cd825c718810ff6f5321e8a7be406
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 17888 bytes