Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cefc9319df3e1b1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 14:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45f954f0dad8754f787d99a27e67f4c6 SHA-1: b7e84ff0178397e4614fb442ec48b161c48d0535 SHA-256: 5cefc9319df3e1b19f8547af7eec3271a20891badba34df96c38df58c424819a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple links, with several heuristics indicating a link farm pointing to compromised WordPress uploads and disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's purpose is to trick users into believing there are new banking instructions, a common tactic in business email compromise attacks. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2fd9689f---muniti.pdf In PDF document text
    • http://dpnovelty.com/upload/files/48399834330.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nomebapisazavopo.pdfIn PDF document text
    • http://herve-coiffure.ci/files/29980877745.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/parufu.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/soxipede.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/lafkpjl0jro812mbi3a8vrod83/94583279177.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/tatunuzomidi.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/deganun.pdfIn PDF document text
    • https://krossi.ru/images/content/files/puneb.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/77835555047.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/guvukad.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/dugimajiranofifizaladabub.pdfIn PDF document text
    • http://parateam.cz/file/14857144689.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/53113764638.pdfIn PDF document text
    • http://wjcopy.com/upload/files/73774347179.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/pigujeseji.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/46867873246.pdfIn PDF document text
    • http://mobil-tech.com/files/44690679974.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/davenasewugomujalibez.pdfIn PDF document text
    • http://sartor.ru/upload/files/getotemubuxokosokiwo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b2c878af6057ccd518b71f7f3c70e60e/josorosabepim.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sfi9acg32r0jn3g8kr84tjftgm/kowirenowerixerafamiwokeb.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/barujivo.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/lepizidetisijokarexinej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+clear+all+data+on+androidPDF 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10272 bytes
SHA-256: d30121aea8196d8d2baf73c0bc94e202c2bdc98d491566a9cf5affc60b87cc56
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16948 bytes
SHA-256: a8764f28366ec06faaac77a09a7eef3eb32ac6f4a13525a165a2a268e62e0187

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