Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bec22e5afc5ad80…

MALICIOUS

PDF

91.9 KB Created: 2021-08-22 13:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0b01ac7a84789504e1f754f8d0ae926 SHA-1: e3eeb57f859fa40047c18d75eb39f5fcaa76af8e SHA-256: 4bec22e5afc5ad8003fcbfa0698f35ecdfd12d3a06e174b11f01fd48d8935788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://deccanquest.com/konadnew/userfiles/file/padiraralakuloliba.pdf In PDF document text
    • http://test888.org/uploads/productsfiles/20210706065730_b496c.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9adc8e12---zagisolegorifuwinozafexu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/48840958837.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf6d771fc66edf1a07302f6d5d78e2e6/50192673183.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/sekevenerapuzozerufuzukip.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9a003bb0---51038290153.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/667a780ff9360f7d574a662182be7f48/85695152578.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aa8d98ed4---xefirur.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/nogubox.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/pipopezaxosejowim.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/todabafulelogaka.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e2b4be88d21d086244cd4d3224dc7645/5995373646.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/38324927167.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/f4ikbmmus0c9qho5igh73sl53t/xuvowodavibufujodojifuzu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/eefb45f1afff2ad3afe15c01dcabccc8/tipejovedesafubapuxizu.pdfIn PDF document text
    • http://koddous.com/userfiles/file/56981859399.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/68164249373.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/50407921110.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608879cac6eb5---mimitotexebazelikuse.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/sefitajifunibudosax.pdfIn PDF document text
    • http://iphysiology.ru/upload/vuxarobufa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a2edf576c303aae8e744b5f342b6b84b/fajagevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wedding+party+favor+ideas+pinterestPDF 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_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 17388 bytes
SHA-256: e91ba28c1eda5f38fe1b8f5381ae426f073240198b369b8adc65f608055c2ca6
font_01_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 10800 bytes
SHA-256: 83f389cce1d9945bf178027ea5d5346ef38267a5f5f0a0af2d92acb686b1cdd5

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