Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd40f4146effd18a…

MALICIOUS

PDF

84.8 KB Created: 2021-08-21 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1fa7342f352ba07848e063c7f71bc697 SHA-1: 0144b77f56cdb0a3bea07b1902102e3edac848bf SHA-256: cd40f4146effd18a0f4f53367309861f43e0105484f9070c27f19eb306e90d8f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39a46bd619---26413672739.pdf In PDF document text
    • http://wienbildarchiv.com/upload_files/files/gofewegedukafotafewabuma.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/df116469ddc344d250f08a5f4063d1c6/rumifuwokokixa.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f5ffec6f630fa05dfe4a4a411131f2de/zobidozumuzejefowak.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/i673q35111cvvh29029bsjhfbh/viregemuvuvevoxifadute.pdfIn PDF document text
    • http://mfahk.com/upload/files/gexikefuxidovefimajabajel.pdfIn PDF document text
    • https://senhewood.com/d/files/74310083027.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddcc4f29e---zetezobetatajara.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858b0b345b0---ragimavajer.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/77308044732.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094acb9a1f21---zufoxow.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/rokegof.pdfIn PDF document text
    • http://poorclarescork.ie/images/33559406365.pdfIn PDF document text
    • http://finchamauto.com/pics/fesuferi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b4d9341f935ee886a6b1559c6415b1dd/61000432530.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/df43adde18c13958fe0209ac060b3a3a/16244927970.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a35dee61---77438425057.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/31840484933.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d694ef7b281---lowanilafa.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/giwazolopukunewaputoxar.pdfIn PDF document text
    • http://dytac.hk/userfiles/mewigujowitefepemevisuva.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wuworogafexaw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/625fa395096f8dfa8ade72a5cc879b0e/sulinemetilirebejadelere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=simple+disney+piano+sheet+music+freePDF 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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 11176 bytes
SHA-256: 485530e14b9d3cc3251f04fcb9711a4fd1f40d9487df9dda1ff45ec1264d7293
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 17192 bytes
SHA-256: 92190d2239e7c9dc0714f0d539330fe9ab90daa00d1a5ec7998100da2bfb9989
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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