Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82cc625980d1845…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 13:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eae5562961a3d54db38d596d0389fafc SHA-1: 1626bf796d79943e46fa53df5d65625ec235fb07 SHA-256: f82cc625980d1845390adb2072c03487725e8b5632242c888781b6af5ddf9a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the links and the 'link farm' heuristic indicate an attempt to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=convert+excel+to+pdf+online+free+without+email PDF link annotation
    • http://prime42.ru/userfiles/files/dejitixoni.pdfIn PDF document text
    • https://digicpictures.com/downloads/visolikafemiwuxaduro.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/viwurerurewelo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/l7j3i6m1c0ing992aua5g5eek0/47568350761.pdfIn PDF document text
    • http://njxinbell.com/upload/files/wolupelize.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/mizudipukuxirop.pdfIn PDF document text
    • https://grandegroup.net/files/15853392595.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45340c310c8425fb84afbf45e58b7e00/43984475577.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/19726617409.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/22937081410.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/mezupo.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/silatijufalubavikipexito.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27568028816.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pixakexijobuguraf.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/4436576359.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/51328229570.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/26154850286.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65917301720.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468e56aeb35---ligumikaxazapuvedawux.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/16967442014.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/21084150573.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/jiwovomitosevusibaruzunax.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/68344797539.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/kiguzidalefizuk.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/jefisuvu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/viwaxerenivokavepusizipak.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 17844 bytes
SHA-256: 5ec376330e96ef971f244b6ed82e485846e94b2bb09f846a55cf8d5421a5166c
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 11100 bytes
SHA-256: 2ac0bb0e8fd5df3655466d3a9882c84e1ee7328c80e318b494ac66a47822e147
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1