Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d040f30b7b3eb9d…

MALICIOUS

PDF

74.9 KB Created: 2021-07-25 08:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5db1cc62a6aefce396f94b3a24cb0080 SHA-1: 1660c6e1fe0ccc3378edcbb4620a0f7d6ccfc431 SHA-256: 1d040f30b7b3eb9d0ddac5b68931e9dc80a5d74fc3a1dfb65aec9edd27ca3838
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The presence of a 'Password-protected archive handoff' heuristic suggests it's designed to trick users into downloading an encrypted payload, likely after being lured by the document's content. While no scripts were directly extracted, the PDF structure and link farm behavior indicate an intent to facilitate the download of a second-stage malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kltccompany.com/ckfinder/userfiles/files/37845311875.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607047c70542e---worefo.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/22528605093.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742a8e51831---lemumojosupagado.pdfIn PDF document text
    • http://limmaginebistrot.com/file/1482746391.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qn61fvcn0hckacl8mm4rmagbg0/25592932982.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/386be5d2edd923ddf6d10f9cb486d463/13378466572.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/70954956444.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/86717081144.pdfIn PDF document text
    • http://terminsk.by/pics/files/18623424576.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abf97c5ed---mogug.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/kijukorogolekitu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e1dbefeb7c37419896033c51dd281a7e/4411255007.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61c608a8c---remerisa.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2cb20078---goturo.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/62035092719.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/93000220979.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/gebifipabefajavejixed.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/18359282789.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/xamoliwunasojorumetugot.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10mh930pvm6rg215i3he1v53v0/munivotarewaponarok.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/91711743845.pdfIn PDF document text
    • https://digireg.cz/upload/rararipisutekorenuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=medical+dosimetry+certification+study+guide+second+editionPDF link annotation
    • 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_off0000c2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 11024 bytes
SHA-256: 5f75e47fd3715fd8a625d6cd5190b4708cc481399fcaefe7096161e1ff55651e
font_02_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 16048 bytes
SHA-256: ae3a85ffa37d6d674c3b6e18c1d767a52832bc7b4e751ebeb2ed81611c5cf9c3

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