Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dfd56ec391b3c9…

MALICIOUS

PDF

96.5 KB Created: 2021-07-06 15:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 369ce36917e9419d07199b130cae08d5 SHA-1: b225b0354cee8e9351ccb0b838d1907c8b037c5b SHA-256: 81dfd56ec391b3c9e54b23f71ebc501d0c04b658d61403309d5dfb1b701fb343
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a payment redirection lure, likely designed to trick users into clicking a link to a compromised WordPress upload URL. The ML classifier strongly suggests maliciousness, and ClamAV also detected it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially compromised sites and the specific lure type point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://phuclocvienjsc.com/uploads/image/files/94970376726.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/17752773050.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c9ce4e200760b8e939da769a07fa59/16555083958.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/jetego.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d81580c96d37263dd074ebd0aeecce21/ribunexexiwuwo.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/26946337381.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0493cf18---47298012853.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/texabazumoda.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/53351779792.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb0210ab7---jonefafaxifub.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/nexibuzopufo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3be135f8---14547270292.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9074d8de---majesobijep.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/dc66a2fdd908321271196b08a8b9ef29/3644931219.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1b518798---83611627774.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/26pk1jk0ssk8d2tgn6b2q3o10o/12648254580.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7cf4ef4d0---419724110.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/93478775318.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/43693104107.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/5918422157.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/vibinebunugefumavejedit.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea3080f8f---limapazomedu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/490kqs0l03d9c8l1kdd2l73agt/ravipiwarafugakobezokuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=working+capital+management+in+banks+pdfPDF 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_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 11188 bytes
SHA-256: ea207b26da4e641ea67dbba04f0fd43c1c336b687b974df05d09f48086d24f98
font_02_sfnt_off00014743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14743 17492 bytes
SHA-256: 39bcfb32e4a4e68da21b51ca353642a6e7247301578dc7904614edca93be7d3b

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