Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf23ce36dbcdaf7…

MALICIOUS

PDF

84.9 KB Created: 2021-08-28 14:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 541c27ff30064155f90b3660f05ca55a SHA-1: 72e9557e57609d39d920241ca372de72ed0941b7 SHA-256: dbf23ce36dbcdaf739aac0556eebe116741f551281c6d55aa8f90bc33f9afb80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=if+i+said+i+liked+your+body+would+you+hold+it+against+me+lyrics PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/85809e5505623b4464fd3ad5f1badf48/98012626712.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/kosedavibudegumejujafek.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jawezewimidorukopagad.pdfIn PDF document text
    • https://banghenails.com/upload/file/wurebilo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/spj1oldfgbbmaq4j829l6rh0as/vopivobotokizupubapij.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/65010610667.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/36748024977.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/voxan.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3c7d5735be1f9218c15612f88f81e1f7/tezotateseguxuzubefano.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4adba55c73088afc2c39ac2ef18daa47/37795899631.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70514402042.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58652101952.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/78900509286.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mowezuxubape.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/noporekodumimivawuj.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/735a332cd13344cf88a65ff45ed03600/24075766927.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqvk15c7eakahtihej5hkf25q0/66352439981.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4ed33530e5876c8d7136269df1915676/51312452102.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///72539703006.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/xorowikuwuwevige.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/jadufevunusewubosolesu.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/57903097150.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/mumazunojigen.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16104e09e20c15---12565884542.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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 18040 bytes
SHA-256: 7de402f09642abb0016ff09867ab5421643f3e232b51912654a44be1919c6d00
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 11404 bytes
SHA-256: 3fa93c04f02fd1075cf4fa6abcea514e613accd6fa22202cd81fe791d55ca8f6