Malicious PDF — malware analysis report

Static analysis result for SHA-256 16af0e1398c7c1f1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 12:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c18f6370e54d8fded9d65b4c0b7e05d SHA-1: 1615a769ba9df034c98eb1051026dd18c3d297db SHA-256: 16af0e1398c7c1f1d9dd24b8c5f8750e0d52e886fa0a3147e2d8d9449dc054bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous URLs hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=download+cosmopolitan+indonesia+pdf PDF link annotation
    • http://aldo-ins.com/userfiles/file/nowowidowesudejabufotit.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9599b1eeabe885e19270b5ea0460ad82/21927594114.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0ts1841bet7oq33did5f7gnnmv/40431162246.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbdb411feb---14044008121.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1c8d96c71bacbf534402ca2268f1f237/69983112619.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/90853185564.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/38e76b3171e8fb37e106a32eab6ed388/40657359257.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d52af28c4---87617877977.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/1670048090.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kebulofaxukiderusekisepov.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a9411cd11199c0b869abb1b19aa44d6d/85988119195.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/805a7687858abfbe8c0abf025bcd5a2e/wikonatavuriloxituwupoge.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b8126873c6a730997f1a875f9b03192d/5215283921.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/31614893186.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/73060429099.pdfIn PDF document text
    • http://lyshiying.com/d/files/vixumabudef.pdfIn PDF document text
    • https://uudanbury.life/files/file/kavuzunix.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d0893334acb30796231aa8ef6fe28cf0/mumudopunojituzogakiva.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/5426329332.pdfIn PDF document text
    • http://emeat.ru/var/files/jodejevipefafaku.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c7042c3ca---kifimomezalozed.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13799969786.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tefufuxukekeriwusora.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_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 17888 bytes
SHA-256: e2ea52f316021be404882452e28a9e67e5175fb24edb0575ee07699b6f765ad6
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10768 bytes
SHA-256: b7ff4093bf614c05ff5a1d26e39837feb78a6a621cdb390b5c766fbd47b56384
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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