Malicious PDF — malware analysis report

Static analysis result for SHA-256 234c2fb562bdc85c…

MALICIOUS

PDF

97.1 KB Created: 2021-08-16 19:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32b74d05ecfaf6b0524a4aa07ae96a83 SHA-1: e3dcc74436490cf80a4b21aaa51a3a7ac0098739 SHA-256: 234c2fb562bdc85cfdc39ec3e956a57c693ee5eeda2371d19664a1e4956f09dd
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a payload. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a link farm used for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://nedirajtebosnu.net/userfiles/file/jasonefudurasis.pdf In PDF document text
    • http://totoquynhhuong.com/upload/files/2441074229.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d043da88---45366113164.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gumuvatos.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/33709342542.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/4654438168.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4778c834cd1126e354d62637f83b2975/21739332314.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/30952086233.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/xapevos.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/92554358817.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b309d00c8b2---nifunekawaritesufuviridus.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609832e21e850---70435390432.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/23176934188.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db86821a5---16890145577.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/32240p13tjl1scqkpvtd6kaa8p/nurajasavadepadulisa.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/kuxubakewegogutakagaxe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d46a51d24---96215121007.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/871e67ddc2442a6d8a5f3654c7316c82/nasajafeviwonakukalimo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/dorovanulowifatiroruro.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kijogazemiralutufilejujuj.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vavagodevalaposev.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c937dff33---92765688200.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/93199494091.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5bd321718---71571103598.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/lujibisorusof.pdfIn PDF document text
    • http://laduses.nl/image/file/fawagiguxujeliki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+reset+undertale+switchPDF link annotation
    • https://www.youtube.com/playlist?list=PLJQZtsZNm8a4MckYi2P4V7DrNWY8QR1kxWelcomeIn PDF document text
    • 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_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 20400 bytes
SHA-256: bff1d5ca5d5f20f645d431924730291e0db36fa02b5a9853aa7632590780a813
font_02_sfnt_off00015cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF3 10644 bytes
SHA-256: e2b9e8f2dd2d0fff72d4657c69e6a00de176c4ce789ff1fdbf515b8b4b2305d4

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