Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d1fa16965216ae…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 22:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cb88413953885a1d3953fb93462fed3 SHA-1: 00624631622a1b174859be20bf87b1e095575ad5 SHA-256: d8d1fa16965216ae3d67d5b7c31e539550aa30a197a4583b479c3b6b8e79c0f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations and disposable domains, indicating a link farm designed to lure victims to malicious sites. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=short+bond+paper+size+width+and+height
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/s5jo2ut1vg1fq9ooc538bqq89u/54423904765.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ff5ac3a1c6595d125e9a0c7977c9fbf2/26267033964.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/25e1d878e135ced4da96d8806d26960d/zezasokarexowaderorule.pdf
    • http://domeinbeverdonk.be/assets/files/file/39816419435.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/35416317213.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/22d8640fcd313fdd7d58fa2c8e6977a1/36117382000.pdf
    • https://akvaguru.hu/user/file/bikatekunabiwevobi.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/9si4n27rr963koloelekh3vl3b/xetulizisititilafekisegeg.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429225626884075.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed23428d7f---56030486663.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f81abec1---xevesepezusibini.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093b44bbce52---vigut.pdf
    • https://daquin-ferriere.fr/userfiles/file/geposesiminikoturotefuf.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9b2a2572---volezemimelogu.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7df900e53---55884442599.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e04a55de0---mopajokopobodibulagu.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160845ef71bea8---67328798150.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f487a95739---69470060192.pdf
    • https://scalper.ir/data/files/file/83513748111.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca25b880058---denesufojerus.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98b6dea7d---93004450096.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c889e15527e---fufujevumuvozigasi.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9i2u4qd4qbqps8vr3nsa0hbso5/kosapujomumabakum.pdf
    • 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_off0000fa1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 16792 bytes
font_01_sfnt_off00011231.bin
bc9647994fd5f9ee5473628bd8eca43e5572cd3d2ad82ed3b3ee5cd51b793a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 10988 bytes
font_02_sfnt_off00012b4b.bin
b891e4e7544fd3ef86a6587752b5f9d0d0e02b76f9acaa8f9d66b75aa2a7e39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 19000 bytes

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