Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8f19c05eed9364…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 06:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 988a14e4ddce26f54dba04a407aa044a SHA-1: f63d3ebca570b214188ad0440092c0fd55bcff71 SHA-256: 8b8f19c05eed936405a646558950095c6272705ffb8d2ee1c0c88432160f113d
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://queure.ru/uplcv?utm_term=fake+gps+joystick+and+routes+go+apk+download PDF link annotation
    • http://universalgroupautos.com/files/others/2243670233.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xosurimiru.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iime3ivdjpl4fo3dppvup94ubo/ropepitigiromapufuza.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/57239122401.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161464bb1ccd2e---gadatajukuguxawaruvi.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/lofemufujikejusisegana.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/71406852507.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/11347519474.pdfIn PDF document text
    • http://synfarm.com/upload/files/13109557601.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/85853536125.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a5e31617fd713c4909eaee2f5cc89e0c/7724583225.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/86023582298.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/79540185208.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/vorotavonetuje.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/xewokigosireketugoj.pdfIn PDF document text
    • http://e-hematologica.com/users/file/xizegetagozovekako.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/11052220212.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/turawusopatakaxigajivo.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/91700091040.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/mogofut.pdfIn PDF document text
    • https://windscrm.net/files/file/54689676438.pdfIn PDF document text
    • http://woykoff.hu/upload/file/tajozaxefajuxobewavinupa.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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 11188 bytes
SHA-256: 2f420916a5783d619d6d1a6548faeecc83a27a70c9282656ef4964fa9eedbfcc
font_01_sfnt_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 17120 bytes
SHA-256: 2e9679fe478d69e10f35659cb8a64dfcf58d7865448c5d925fd8a1a43e5f89ab
font_02_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1