Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fdd7773c2cb7dc…

MALICIOUS

PDF

67.3 KB Created: 2021-09-26 02:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7f20d858257666c4f476a7755a2a2af SHA-1: 8e3cf3ae0cf00b2e91e8265522504a068973d9e1 SHA-256: 57fdd7773c2cb7dc107c4570ddef1eb779f47148b663218caf2901308c72a044
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, a common tactic for phishing or malware distribution. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ctners.com/ckfinder/userfiles/files/42006126350.pdf In PDF document text
    • http://yildizteknikelektrik.net/resimler/files/57654343665.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/tusodijebasaboka.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/76200544309.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/pifiviwuzo.pdfIn PDF document text
    • https://subded.org/userfiles/file/kebusewijebidusowamataf.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/leximabugenewoz.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219151933413668.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/84173530814.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/70539139571.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/viieasc3slgvl8dq837dv48ua6/3767200680.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/16008436411.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/gafonodipub.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/sinirawimalapubezur.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/70746907977.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7ededd4f8---gosofepitasu.pdfIn PDF document text
    • http://medica-brno.com/files/wexamavaloresorupavapebox.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/16142707580.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/59600048439.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22689f2e5---77028603674.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/62472915291.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/fukarozoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=effacer+historique+android+marketPDF 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_off0000acd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD9 11016 bytes
SHA-256: 0ce02d6d4690409adea9f5c57c3388f11072f39b8c9fe36eeb294da22afa56d5
font_01_sfnt_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 13800 bytes
SHA-256: 27627989826d71ace5c4e120782d67a1f866470526218930610982b414ea9c56
font_02_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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