Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f0bef3b79d31dd…

MALICIOUS

PDF

78.7 KB Created: 2021-07-07 23:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dce0fc544cb117da478b0647ff5ed957 SHA-1: 182a8bb40021e824bae8f9a865f3a9e9a995b07e SHA-256: a8f0bef3b79d31ddae2a9b5e70afbf1e2f32b6791048397e7e8703cfe42e76f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2acc665d01b890c4ba6c3d7e31f31ef0/52003832025.pdf
    • https://dm288.rs/slicice/file/46659087231.pdf
    • http://vejwun.cz/images/93848539573.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b647b4e7e2f---72471054314.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/94648088045.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/24af71645a2136c79ccc0b45ae632d97/gojefarenonukezatasivirij.pdf
    • http://komputerzagrosze.pl/userfiles/file/20013284824.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789effeb84d---92006420675.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/24843da37564fcf43acbac1d6fd0fd9f/lamurufeze.pdf
    • http://mea-travel.pl/userfiles/file/72496306512.pdf
    • http://chennothinterios.com/uploads/file/85390311956.pdf
    • http://centrons.com/uploaded/file/191084200060dd840256f7f.pdf
    • http://wintec-samu.hu/uploads/files/73098081074.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9424203a9---mukukimuluvuzimazeperab.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tpp7sfvt0e36gmlesefabluav7/10343084286.pdf
    • http://hicoweld.com/shop/fck_file/file/bomeduwewab.pdf
    • https://zemiigori.com/uploads/file/5751668028.pdf
    • http://baugeraeteverleih.de/benutzerdateien/6023677089.pdf
    • http://textingrights.com/userfiles/files/21616249818.pdf
    • http://residenceraffaellotorino.com/userfiles/files/dodilerine.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/56013209525.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8519932415---43483934163.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=international+tipper+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0db.bin
7e8d6f4fdf4b23d6a32cddaec3e2d4dd6283b4b7bd3d267a990d61a2542a4d65
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 17576 bytes
font_01_sfnt_off0000fe4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 16792 bytes
font_02_sfnt_off00011661.bin
949f919a37b1e38f36a80c43476a856e8c8900ffea9f8893418200d5dedbb7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10304 bytes