Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f87296a623f9b6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 05:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2d744b61467d953fbba9ed1829292e2 SHA-1: f558425d221960dde72c319260408afbaebd34c9 SHA-256: f7f87296a623f9b62bd142f0bd42ae9e45eb7d2c394a8df0d1905aae8cab8bbf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to potentially compromised WordPress sites and IP addresses, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.uflo.edu.ar/ckfinder/archivos/documentos/89906682282.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/vodisalexanupaxe.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6b970ab85edcf8d382a732b332bc74f3/19934845711.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/45385253986.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/om248tp4bnq40t2sdkusoho7hs/buvabizalimafase.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/74456568985.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dalomu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/87622314303.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/76809137649.pdfIn PDF document text
    • http://terminsk.by/pics/files/98791598646.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/bezobu.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/51008578317.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e075d88c0e---depojisumefusifojuminake.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05d24fa73---65346665191.pdfPDF link annotation
    • http://goteneplast.se/files/images/file/gadusijele.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/50253381865.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/18cc4ecdc8fe790d1fa249cf56db8ba4/31862742196.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/85379898829.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879b567d24---99428582212.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b47d74f395cae30b18315e10c20bdb2c/babuzut.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/pegowofavepetuk.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/givadabolegasadiwadog.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095e769ac826---77195454705.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210607152508_ubfa7b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+repetoirePDF 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_off0000ccb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 23024 bytes
SHA-256: 74db43dce55414a3a1e04eca48630c47e2edca1bc6308c150214e46994d6305f
font_02_sfnt_off000120cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CF 10312 bytes
SHA-256: 90dd874ec2c7e0aa8d8c55287afbe7cfcfcd93a6615257156bb7c60d700e99f7

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