Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c67ca56d78775ca…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 18:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5383fe802245a9d5c38e19ea29c854a SHA-1: e79420180036831d2ed271e10bfbb121701e1f93 SHA-256: 6c67ca56d78775caddb7f56e13b6e077c6e4265e04be38b9558a6cf1521c0512
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into believing there are changes to payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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://alice-immo.com/userfiles/file/mubirumiwivakapama.pdf In PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jogibanofufo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/899300972613e7ae1244cb.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/50799747945.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/melataperexadederutalila.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45318723327.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/divekakojitusofufi.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/18637249701.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/55108203834.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4a60c0f1a6321c26593fd60e5e9e493c/75523767345.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/butisoporukovulen.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/fuwenoluxasodolamokujesam.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053a3d892f---93082811776.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1vc5dhltnhqb5o5f1o350g4pun/39991143857.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/fajazadujoxi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7bg2an2adned9vrodd4glf9a7i/29256013107.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/52at1tf7e4c2vjtdfohn0837rh/banunewo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa6bf0cd2---12873198925.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/jinosowojupu.pdfIn PDF document text
    • http://kftchem.com/upload/files/dezurafesubiwokif.pdfIn PDF document text
    • http://polletnv.be/uploads/files/6659081099.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/64080140302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=popcornflix+mod+apkPDF 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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 10580 bytes
SHA-256: 06481ac3d3931669d02aa064a8d37f5e00a02827094db8fc2181c0acd0c3ee93
font_02_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 17096 bytes
SHA-256: 4c43842391988ff33ab51403de8a75e8b6be1d846a25c50ee974b5d111b6da71

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