Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f60e678276eebd…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 10:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7d07ecfe1b7affac73f32bd714fc543 SHA-1: 99aa32492ae8e5d517ad6262d2b1dc65c1fbf9b4 SHA-256: b4f60e678276eebd3f932bc07256484dc86a93c2e916c897b9f0a42b10f39445
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content, possibly related to sextortion scams as hinted by one URL's UTM term. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also instruct users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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
  • 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://mytekas.com/UserFiles/file/bavitovovajusila.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/694016cc1772c1fedc6d1fdc9ce50ab1/59433560944.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/todumavod.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/54572482618.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/01152bc1755ce89dd92d9a71dc1b0dae/guzelulugexukodaviduvim.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/meveka.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2kk6bsj6efuufpace3k8b4b6q5/rubiraduvarezozivi.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/5844821805.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/rumezojatusewiletoji.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd9c6e2ca---43011517501.pdfIn PDF document text
    • https://dineflon.com//files/rafadabu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/35448785378.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b489bcd2fe3cd68db454c405ec4a7e11/sudomedikomu.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828934b9a0---78268892986.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/84246417025.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j47i4qcpdh6r81iq4agsmrrap0/800803230.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/62260927035.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/19450182521.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e27db0294---litumamanotujeralibiner.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/rakobafapuv.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/mironeziwesokit.pdfIn PDF document text
    • https://dm288.com/slicice/file/92747456776.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/puwovawewozikowiwabewu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/33462748663.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/ligurimoko.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/273711fa4282e9e48ec38ad117af53b4/tazijubibana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sextortion+email+2021PDF 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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10572 bytes
SHA-256: 5c6e66714acdf3a62b0efc64408627e8d753fe7795c46c2f2412e23fdd6f62e4
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 17960 bytes
SHA-256: 0cadff7b00768ca9647b8a785e4d9eb8917caa3129dc122a380cef3558cf2ff1
font_02_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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