Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5726a7323c83398…

MALICIOUS

PDF

82.0 KB Created: 2021-07-23 02:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 836ebda6ae78b32347d1db4b0718726e SHA-1: b8d5d5d37bf3d0d0871b76c7b262da30aee8e731 SHA-256: f5726a7323c833980bac620b5f1a816ca6eeb387acba23b1015ffb94973f889f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document is a link farm hosted on compromised WordPress sites, likely designed to redirect users to malicious content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb5614ad73---70960357521.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740e1992f51---51163657444.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/52202377867.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0d2d4091---3652986299.pdf
    • https://ludifrance.fr/userfiles/file/3796311004.pdf
    • http://angelescare.com/userfiles/file/50261945145.pdf
    • https://stratasphere.online/userfiles/file/fafojojatagokin.pdf
    • http://cpils.com/userfiles/file/50003946765.pdf
    • http://pphu-joanna.pl/fckpliki/file/76577109255.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754519194c0---wekawaposomadin.pdf
    • http://qlinairnv.be/userfiles/file/noxiwajibobubexizer.pdf
    • http://mevlanaasm.com/resimler/files/lutavuropipebapanamiriwam.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1917d9c203---81579964877.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa3523171---tesesifofikafiwem.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1uaer0gb470hrtsrdua6na1tv1/22619933528.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e043bbc1---dilopulivumirunolusakazus.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9449f8301e2a0d42ffe612957f4df335/82644802136.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c028e1e5---15449308244.pdf
    • http://www.anclupnapoli.it/userfiles/file/66321411981.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d883f15ac3---muwaredofade.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc0fe3a24---buwawagezuwelawazuwulode.pdf
    • https://triosms.com/userfiles/file/95004021785.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=static+and+dynamic+resistance+of+diode
    • 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_off0000dc2f.bin
d8b49826b6eeaeaa90da92d72945a397be139c718633d3dedf3a528de15d2612
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 10780 bytes
font_01_sfnt_off0000f501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 16792 bytes
font_02_sfnt_off00010d13.bin
3ce220c8b0b379456f9b24e80ae30b20c1fb22468b7d3b08cb955eb973586f92
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 17684 bytes