Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9c269f824cb75d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8aebd693d53740da0db27ab86e609c70 SHA-1: 6d09f18b43892a34d6af5a5332349268404ce700 SHA-256: cc9c269f824cb75d98127c63407fc2151e90a222b2f5ce258eaeab5c326f0490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several heuristics indicating a compromised CMS upload and disposable hosting. ClamAV and an ML classifier also flagged this PDF as malicious. The presence of these elements suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://cructi.ru/uplcv?utm_term=cabal+online+mobile+apk PDF link annotation
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/31461699205.pdfIn PDF document text
    • http://195exim.com/datas/files/xusazeneni.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/35654054086.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/78547601867.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/57622842628.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/lolobivoguvelazarizo.pdfIn PDF document text
    • http://midospa.com/upload/files/54249365487.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/jijilarikerokuviwowepubu.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/tuxozuxoz.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62c3df28---52403016186.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/67422156083.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/93977266342.pdfIn PDF document text
    • https://jobtiara.com/files/files/7251496030.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d281fd6b0e---nefiped.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/rawelotoramilorub.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/pamazodokokuvopek.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/22176349912.pdfIn PDF document text
    • http://xn-----elcksuhhemsi4e.xn--p1ai/files/files/lepezakujiti.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/dodamugikexiwakitisumab.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/54302497777.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/digotilujuru.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f9ad31d82771d1a68657516d0e87687/wixawilaxog.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/labubevipikudefukuropapo.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/54968124904.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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 10308 bytes
SHA-256: e5f9efb1febca98ec8fb6100c7c6b470c9040258a05b39ae83c335d4a307b88c
font_01_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 16864 bytes
SHA-256: bef1ec5f0dfbb788387bf01378a4c688283318321633ab13e87ed39e68a9fd5e
font_02_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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