Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac52e7d45154b1c1…

MALICIOUS

PDF

84.7 KB Created: 2021-07-15 15:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528d3d775e7b64eb6986d0e029b9eab7 SHA-1: c2f8f72ac282bbf69bdbb2913cfef0fc44f2fe94 SHA-256: ac52e7d45154b1c17035edcd3fd99119acd173da95f6da01528712a34d4e7465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript, though not fully detailed, further supports the likelihood of malicious activity, potentially for downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d72f708b767ab03ec66f1d31ac8d3a9e/93523071998.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/daea642310d52b9bde9bd14365d84370/20283295536.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/61611b97add4be5a5b45b7b8d960c6ae/68852359677.pdf
    • https://volnynaklad.cz/data/file/30430442411.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec7f08c42---7406226081.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4ebea25a66bc4a88e0c46e6f7ea20018/nawudonowawewudofedukobo.pdf
    • http://evohome.pl/userfiles/file/borirugogujupopepidopab.pdf
    • http://iltorg.ru/upload/file/90101280998.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/21358713699.pdf
    • http://tofuyatogo.com/uploads/files/38843965666.pdf
    • http://asfalon.com/__files/file/lunegegofetokalit.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/403107861585b51dfbb096f1c1ffa1ef/94127002145.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087be73905c6---duteginugex.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c0707252ea86b4c364e0f5af80abe203/81310353290.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/47528311305.pdf
    • http://3q1p.com/upload/file/210620182036236377tt6nuby4c2zj.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794ad129be5---zegewulolunaribafed.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d59981d0---tofosulise.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f0baaf1a---xepori.pdf
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/liviganeroradelubixev.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078468820fbf---bariwebe.pdf
    • http://yangpupark.com/uploadfile/files/xumoguse.pdf
    • http://kientrucnhacuagio.com/upload/files/75528221266.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c1f17cd28---wituxam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=of+alexander+the+great
    • 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_off0000e694.bin
017853dbb1d2f9ea5f87801b8824a6cb2e132dc9957af1297cff2946a08f556d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10380 bytes
font_01_sfnt_off0000fdd1.bin
57980cdd99b76e09cdfd34687163f28e60b6bc45bb6d1079e601c4d8f63da6df
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 18044 bytes
font_02_sfnt_off00012c24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes