Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce009e1bd0bcdf7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 18:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8013ee81d0a45912f1fb90d8357bf186 SHA-1: 4d7179e2aace875edc161c6925a2924bc52e12fe SHA-256: 7ce009e1bd0bcdf77af299cc4021e3e1b4c9c95f3f551b8d7eb6d295b2d4085c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically suggests a tactic to distribute malicious content or phish users through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zweefvlieg.net/userfiles/file/kaxirebu.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/kakefofisez.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30ec5f2d389836bc0bae0cb945add982/xabakemugiwaxaf.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/63095969197.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/47370686876.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xukipewo.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/xepitor.pdfIn PDF document text
    • http://mamam.by/upload/File/file/xejugilerenanepix.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/badexeboru.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/faboxikesekivu.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/ravesovozazapasororogan.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613019c26fb0e---91293863319.pdfIn PDF document text
    • http://techbis.pl/files/file/72476668953.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9ab074b8b0bc041cefb9a95eb8976081/wufazewegavezagimir.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fonetofejanoridinipoxi.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/68823907454.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/rovup.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/63274217839.pdfIn PDF document text
    • https://digireg.cz/upload/jekunosobi.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/4678381746.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/dikijederiwerurenif.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/23211825544.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/57283598773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=reported+speech+questions+exercises+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 18372 bytes
SHA-256: 5a391fc194d1d92fc29913bf29d4d556ac1d29edfad20f4483df817d30698aad
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10904 bytes
SHA-256: e57dd6619ad7b7751ab0fbb12b7c006c505e3958f3407f2c0afe64712642ba0d
font_02_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1