Malicious PDF — malware analysis report

Static analysis result for SHA-256 842bdb5f0462576e…

MALICIOUS

PDF

97.9 KB Created: 2021-08-12 14:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cd835b4c2720137158468f8bca3960d SHA-1: 31b7fadc3f9f53d587ab5300b775e8d24a53a8fb SHA-256: 842bdb5f0462576eeaa99e4e1efe9a1e357e79f523e40a015ef105737e38f08f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it functions as a link farm, directing users to potentially compromised websites or disposable hosting, a common tactic in business email compromise scams. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely to steal financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://freeski.hu/freeski/file/gitipu.pdf In PDF document text
    • http://shinies.ru/img/lib/file/sodugojezelex.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210806_120104.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/basakemulenedusilede.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1e99577b8---sibesujifif.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/48cb65ec3d27c0025312988d69e0a4b5/buzogedabipibil.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/55344051944.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/lovubotitegesop.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/10999460319.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/42186703255.pdfIn PDF document text
    • https://strechybenesov.cz/content/kesosujomegufez.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b54a15cb---16821807694.pdfIn PDF document text
    • https://menu2uplus.com/images/file/puxoxaxagevo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p6b0ujhmj2qmdo0cq4vvqg4ku5/93490240610.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/gaxosovotorojoramumi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vosimasuwizal.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/92912234332.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/ropuresikonitosanisu.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/47066354185.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663bc74c6d---veketixuput.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/vozunamofilubo.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/38531698414.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86469072371.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/78206dc2d33354fb41335fa1c43deb10/2571964164.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd3f2199d---xusir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=atomic+habits+pdf+download+redditPDF 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_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 17292 bytes
SHA-256: a3289b2c1b33bd1ca855610c5755dd983351ff8cec149ee1e36561fc9a39a550
font_02_sfnt_off00015ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDF 11092 bytes
SHA-256: 872151d492c49124b83e2c990a2fcdae323a37a6212b8c544f9d39283bbd349e

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