Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9801144130e6996…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 09:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 904fce3dab800ee123958e52af06bf52 SHA-1: ef76686458c3faa83516273da653cb3babe83036 SHA-256: a9801144130e6996c8a5c6104a5a4deaeba507cea81d0e0cfd5080766ab4c047
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, a common tactic for phishing or malware distribution. The presence of SEO-poisoned URLs suggests an attempt to attract victims through search engine manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://virtuozi.ru/sites/all/sites/virtuozi.ru/files/93142880966.pdf In PDF document text
    • https://dveropolis.ru/upload_picture/83463017946.pdfIn PDF document text
    • http://zuszdounky.cz/files/zebaxoke.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/837nvghid1er3gllreubsd4198/daviwozemuziferojafek.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/73017836173.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc4bd99ea---kitobodevorom.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/dutuzekuwililexinor.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/98872900715.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/lafugesujisaxife.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5c7689b7---zizonoran.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/zazudexonituzitaj.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xujetawanajupezezer.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/fezoris.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/kazanapuvipoj.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jekutipodi.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/53659256008.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/23207139294.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450f84b9d59---migesinemeduk.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/070fdf6c6e4bf7961bbc29ea872e6bd7/34351326358.pdfIn PDF document text
    • http://salt17.com/userfiles/files/jetazawaravoniziponeleto.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132717d99675---fizadepub.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/67176423836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=robux+promo+codes+2020+robuxPDF 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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10804 bytes
SHA-256: d240b2f6b130f5f674e31c9aa72f2d61cbdab2760ef2a1af87f00f8d87e185b7
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 17800 bytes
SHA-256: 952c94e52639963254a1782ddfd18ba24a8d02efc6380d0e9a659679315b4bc4

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