Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05fc96582542f1e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 05:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16196d212b787bfa067a541a143a8a39 SHA-1: b8208d96abbb950f47af06d13030e65b21e3bb31 SHA-256: b05fc96582542f1e71632067b431200e0078176d9630c5886e4a2479da410828
256 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple links to external sites, many of which host other PDF files, suggesting a link farm designed to obscure the true malicious destination. The document's content is described as a 'Recovery secret / private key request' and a 'Payment redirection / bank-detail change lure', indicating an attempt to trick users into revealing sensitive financial information or credentials. The presence of external URI heuristics and the nature of the lures strongly suggest an attack pattern aimed at financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fd27580bf961026bdf27734c8d9b850a/nagum.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726496b83a8---totavaperuluzi.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/vumera.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/26246186916.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1078808f6---vomuzotapoviluzi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/03971818e197605f5bdcb00b9831f30b/wofalaropupepili.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/mrfpq62b1omjrq3sr8gt6gtbm4/50119398476.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/nudomuziwinigejefikug.pdfIn PDF document text
    • https://ip-pharma.net/data/files/xanuba.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/50436336377.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/45373467631.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080f199336fd---4821861207.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/93473474473.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zudedoxepuzadubelokalat.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c126k2uurams4oa1d9s7guole2/15278830022.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/novilevolufufezux.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/12357595593.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8a97050434f2556b2db07823b4eb8d93/40764352026.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c51e633051174d526336c9b2fd6b45e6/69739717767.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/87289907731.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/95429885377.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c011f74f---94025411596.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/u862b145t7vkfm7blb2i9s1u69/76167067526.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/74089084234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cryptocurrency+articles+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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10860 bytes
SHA-256: 1b69c4106b65eb5c17bb9c504bd6279d81a2b047e5bbc12817b00acfe53a85ba
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 18192 bytes
SHA-256: 43898a6132e0aad6db21aca1278f0ca714f507227b3cf220aa8bfc1f4b453ec6

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