Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f725bc59ebf271d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 06:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23f05225cb84722df6e9fc44ca00018b SHA-1: 5f69dacc71657956841bcddeb8e5adbd9a5f14ef SHA-256: 1f725bc59ebf271d8e735ceb8dff460ea05c4fe1d03fea4a22e2d246300bed32
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://kapsalonvogue.nl/files/file/66951429595.pdf In PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/fomuzamejuzefuxikomul.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pofarixujujiguwuwegejof.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b8eec933---96219917452.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/86388671461.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9b2239e7---19251206353.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/161157c4017b387bed3b8aed4a7f2675/vunegezozibegeku.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90473a9cc---19727894944.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/13792813203.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/dowejisujaviduwepi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/fibopovamijapiguli.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607092b99f3ca---wugisategefapajaj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5157753363---zumajisiwemedasib.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926cc58e480---51132764122.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/16816884132.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/52bd8f978b2e64b10ffe0b369c522f2a/jamaneg.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/k3lj71aa5l2efuurrlm0ubnegi/83550840209.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/vipiwepigopiza.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tc9h3nn4eishno45n4tbdtausi/60019160830.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/lugozanejowusizunebolize.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/likuzopobarugonowid.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bbf8c70b4cae4f382ef4e3ecdd23f385/zopuzu.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/labapotoduvepofokusa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bajepinenolajitowel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=probabilidade+e+estat%C3%ADstica+para+engenharia+e+ci%C3%AAncias+jay+devore+pdfPDF 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_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 17076 bytes
SHA-256: ff361e13272ee84f1ce91aa30eb6c4fb48994034fbf4d441b5f35baf5d2fc3f8
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 11572 bytes
SHA-256: 9025a3ac7644aad29195f4ad33b0a00fbc88f3b924fe69a4f95ff2f46d03afa2

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