Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1fe4d28f6c5730…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 10:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f39e9e9c89ef3da61aab9b462c43b79 SHA-1: 094f34113a773888d99c69624dfb7cba7e0b77ad SHA-256: 0b1fe4d28f6c5730452229e29c8feb21ccbe505cf20223be86c883899c8bd1f2
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE', 'SE_MFA_LURE', and 'SE_PAYMENT_REDIRECT_LURE' indicates the document is likely part of a phishing or business email compromise campaign. No scripts were extracted, but the overall structure and heuristics point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crewmak.ru/uplcv?utm_term=owner+password+pdf+mac PDF link annotation
    • https://tedvandergulik.nl/userimages/file/28293027683.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140308cf3537---bafuzirifizupepubalolileb.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/50852451767.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/1173880043.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wowutuzapisoguwekuzaxixam.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/saxesojegudakodize.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090202200798.pdfIn PDF document text
    • http://wwsm-us.com/files/file/xabujula.pdfIn PDF document text
    • http://labradory.pl/file/jolazadutorudakirezese.pdfIn PDF document text
    • http://wohingltd.com/userfiles/43901586167.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc20a735e5---2192468211.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jujupixusemobasapukibit.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/56677025124.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/56913855336.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wejufawikusisiri.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/22339433482.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/89167043547.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/navubovetojiniwu.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/fivavovijujarekifedazeg.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/jesoropogunus.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/85583034156.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/devodituvenuxitezat.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136da4e5ed7d---xipokag.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210903100122.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210909125455_bwgek2.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/90071925357.pdfIn PDF document text
    • 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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10656 bytes
SHA-256: 2ff32b13c9ee67165c5901af99032d1ba3f522317c7fa02f50f3a9c953c6192b
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 17888 bytes
SHA-256: e7e0493e2f26a622b5c5eab98772fd7bb8a82da39a637d099328235a6a06d3e7
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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