Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ce286e16e93ec1…

MALICIOUS

PDF

90.8 KB Created: 2021-07-10 09:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0e7391231e17b21195211f8d6c775498 SHA-1: 16b7fd37639393d9e8be54ef759906868ef46705 SHA-256: b8ce286e16e93ec1823a24dac6771e96bbb48433dfdd1005bdf5536eb9fc51df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links to disposable hosting and compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://giasutainha24h.com/upload/files/lapag.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b04e4e65---15238220912.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6c7f4c3f883ae2335118bd15c38c411c/90903813316.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/45308438523.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/37463986773.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/rigeni.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/29606958019.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/warejasijuf.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160729c42e0369---sikaradukidodabapixerux.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2tdl427ttc1c3at8nsggu0rnd2/redaxujufon.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7fk9i6l3l1fhk37sg5htheki6s/87327042591.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4683928ff---8927024392.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/serekijuzapajatalevuvidev.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/s1uh2dihsprpoegskjfboi2287/vobixujaxidafum.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3057a5d8072bddd9d3e5f61fba82add5/kanomorupegojukugoj.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sh83sfimnpvq5mrn0s6o6keq97/kebewiwoxutiwinojox.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xevukegikim.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zivogirumotubiw.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcbf20255---vawamolo.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zonirupaxumeberofekawe.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/29638913998.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd4c082e9---91119943699.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/814414583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+pc+game+download+highly+compressedPDF 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_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 17952 bytes
SHA-256: db86a179da789449e56112bdb7dee18deda78cc206c23868f6225b79704ee937
font_01_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D5 11200 bytes
SHA-256: 6d7598b29b27d6a212486f09b4ba26c5fb47c2f83dd728eefa98900b41ba428c

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