Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac4b9a8167752fb…

MALICIOUS

PDF

215.6 KB Created: 2021-06-27 17:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cf2e7b085a816364da23e709b9b0ac5 SHA-1: d0da0276d5c9ce051a88ee7b1ad60f754e493b44 SHA-256: cac4b9a8167752fb5b5e1a5aaf8bd051f3cd4bcde31271e922ad2fb3740f3ab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many of which point to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious payloads. While no scripts were directly extracted, the presence of these links and the overall detection profile indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4db41476---49209589350.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f395a355---67403665574.pdf
    • https://alshamiltrading.com/alshamilfiles/file/7522897511.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c688dfe0a25---fibefinizunuzesukozigemu.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/665917f0a7b92e72c6c40128a281c52d/20653298290.pdf
    • http://lblussana.it/images/file/90072508062.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c97e1b10c66---83864684500.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/24003156343.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070b721973c6---86166452097.pdf
    • http://akkoryazilim.com/userfiles/file/nitujapotojibafuwexi.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c7e8d2642efd132ea2ad55b57a9b3de7/81530632724.pdf
    • http://clarksville.net/wysiwygfiles/file/99147319358.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9de3b4c82d98e5a6eed3d2f131d510bf/fuvovutu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa1798362---wifavifirit.pdf
    • http://cokhiminhhien.com/media/ftp/file/zikiwix.pdf
    • http://s-moonlight.com/CKEdit/upload/files/1505551378.pdf
    • http://sinproval.it/userfiles/files/baritufatojufepapojizuk.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cda4e1c787b75c87a163230a5bf75c3b/kejupadim.pdf
    • http://abwlanham.com/uploads/files/75531030354.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sgla3a003nqlebvkse80kig0j3/dudijakujuduputubo.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/xuvese.pdf
    • http://erictex.com/ufiles/files/83303091474.pdf
    • https://ms02bet.com/contents//files/74763657395.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vmqfl7ukmk980vib4v5b822t02/4092473719.pdf
    • http://crosswaysrecruitment.com/userfiles/file/45181626221.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=system+modeling+and+simulation+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b3ab0e4b347c5349674cd13bb26f515e/76304041562.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_off0002eafa.bin
a48bc25ec7c6d774d456880914dcb574aa5423c76cecb0b47d18cfa2e21de4fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAFA 11032 bytes
font_01_sfnt_off0003046d.bin
e2d0a01e9d661d390c6c0c6cc6d2f8a6558d49625afa7ed5145fcd538db8fec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x3046D 18576 bytes
font_02_sfnt_off00033620.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x33620 16792 bytes