Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4e3b51f7f65ecf…

MALICIOUS

PDF

87.8 KB Created: 2021-08-22 00:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 155a349d9bd88bd3d961bb6656e143a8 SHA-1: 22f93751aba91c26a7e7b78c6d73603585c4a0c4 SHA-256: 1c4e3b51f7f65ecf8be923def71d76fd2eef28abb8f2ab9e2ed7a767d88f98cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=ap+calculus+ab+practice+test+pdf+2017 PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085196c96c83---11102368703.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/94316438896.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/96ca3d0ae0f6076c3004defd6c54cbf9/biwojarerilitejusese.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/pilonobulalub.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6puf4icntvo592r5gt99gffmic/jegatupulelimagowejuz.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/t1qrjs3a0uskaq2b8tr5endqk2/dogakizesa.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/25165905940.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ec639a14---91432413130.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f7cb86e4---22878862298.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/pmaq6j94vmrile74hba9fkj773/68043804049.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fcc85456f2f5a4c9c6d20bfe4b569efa/97924422584.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/60054288700.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0383228c2313b190cec05dd7f39f8e8f/32924828099.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/gulajit.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7794c247b7---lesupepunowet.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/7626051806.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd93797b6---bavuguxutug.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/vutewu.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/31547118715.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971ff18432f---60338773447.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d41903ae63---wonukevazinevopon.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/81166914373.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/tulokiguranesinaxevifason.pdfIn 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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 16616 bytes
SHA-256: fa2fa421192af98eabdd6f6eac055dcc8a114169c7b4c772be7fc2e50848a327
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 10956 bytes
SHA-256: ad6b80df05e000e8e86b581ff767f58b245b8d7eb30c555f5ded1bd7600987c1

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