Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dcbfafcad69dcd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 22:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e80e2f1ebe650c54835e5c671ebb46b SHA-1: 7a3d2c118a728a2b128119c81f4da4c5bb2dd1e0 SHA-256: c2dcbfafcad69dcdbb05336605835958068cb9b4c92066fc65d08f2ea05905a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver secondary payloads or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://becucci.it/userfiles/files/63864141418.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/87535062862.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/75135794486.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/95902819070.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/kokobirobunofomipiligog.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/155789205.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/torusiwaruza.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c9927b1c7dd8f888817ad2ec09dc0ae3/logawebajuxotugatu.pdfIn PDF document text
    • http://one9five.com/userfiles/files/tomebamoboj.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/71062754788.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160845416ca175---lupuwajoje.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/49961734982.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/rujivopegiwupebet.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3af4e29e---muvusepoxupiz.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8juq0nfbu97puf17v3njfn85u2/palasomikutimutakekuxepum.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b85703035fe7b58d6ece1a5904367b6f/sovewozabovazakuw.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/886974cf95838b85294a9ce16944be65/83657149221.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607924b188861---febuderefabitopuwobelerov.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bakevukazesaxezabefeza.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/45764020774.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/kamisufavuweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=speakout+intermediate+tests+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 21828 bytes
SHA-256: 98065755f4d33daa24c4601cf226da648cdc4c8f1c459fd1a5b9f22ecaa7dcca
font_03_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 10880 bytes
SHA-256: a7a3f46f2b842e22f151c7d68ae0cc1a52ae1b0da4abdb24081064ad023d894c

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