Malicious PDF — malware analysis report

Static analysis result for SHA-256 f806c53b24bda86c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 23:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d82c3ab8ca64d2b7dbb10a7f04324039 SHA-1: c32109d73689a4b854ffc36d856ce2f7f906bed9 SHA-256: f806c53b24bda86cc2dc9bdc69f865730ccec579898e147545c6b2575fbc61b9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary attack pattern involves directing users to external URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://ketchas.ru/uplcv?utm_term=attack+on+titan+game+ppsspp PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sag9u0se1r8t6nr28rlahtj1rf/71761682658.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/484210225.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/kafinabemutategevofug.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946bec478e---raduginimazajoredobogi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132190aede33---dugekew.pdfIn PDF document text
    • https://finliz.lt/i/File/vodezoxiris.pdfIn PDF document text
    • https://theurbanthinktank.com/files/tonurol.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8004909b56e01525b0253b13f3b930fa/32710514494.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/82024217063.pdfIn PDF document text
    • http://groupkaishan.com/d/files/20387875388.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fejejatepemabilujone.pdfIn PDF document text
    • http://hnhappiness.com/d/files/52415281538.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/808752562.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/jinafimenisosajomo.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bewunelosudagux.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/75531875568.pdfIn PDF document text
    • https://alev.az/userfiles/file/nigoxobiwovav.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4454c0c0---linavebuz.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/6421201066.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nidijawonuzemum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286b02b050---97626673224.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce278ad773---vibobemalomitagozizos.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/10788821965.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/wutolaf.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31195327371.pdfIn PDF document text
    • 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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 17016 bytes
SHA-256: b312754d91747e8e6d58f3353d19731c0dc03275f1b4989e67c4c61efe62830f
font_01_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 10644 bytes
SHA-256: 68e0160c1e287a68afb42edaf0cef60824d6a99691cda2774334c94cdd6f8a80

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