Malicious PDF — malware analysis report

Static analysis result for SHA-256 81706d2867fb03d5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 21:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e334a7c98d62abfdc61ed306f9c75a5 SHA-1: 9b63c25648dccec97bed0f060416a59445c6d6a7 SHA-256: 81706d2867fb03d5e704f3bf339a4c879ab1e9f34ca29249e781e068d5659023
196 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new payment instructions, a common tactic in business email compromise scams. Numerous embedded URLs were extracted, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef77e6b1---tosinorotuvigi.pdf In PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/kenifujuw.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/nitilabipoxelodasuxesi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rejitekizonebaxe.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/19385055334.pdfIn PDF document text
    • https://renault-service.com/userfiles/63150516010.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/pufegosajunananirudateg.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/02541ef094cdcde52128e921e9f0fb1e/sedivelifimi.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/bokobanati.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/eccc2e6dce4d5cca529ce9620b12dea4/46319822582.pdfIn PDF document text
    • http://retailcop.ca/files/82671971358.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/46116915842.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/xaxele.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/redajumibapumeguzoxuxi.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/53156048350.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zilukivalejixebudaf.pdfIn PDF document text
    • https://reniuved.it/file/13727179149.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/40743189236.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/gudokotemamo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/60788564946.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210910_233724.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/59834651628.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f580443167---3591866571.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/jolaxiluvala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ridmik+classic+keyboard+apps+downloadPDF 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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 11052 bytes
SHA-256: e5cd07b23681d30df63dba07edcb3764d77348d1d710dbbd2472f4118c5369d4
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 18184 bytes
SHA-256: 98131193d3d49de28cdcb042ea19898c1446fc27231d99ddd8cca182110bf16c

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