Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b9cc1a519ca4af…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 17:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4548e4c8ff75068ec31ca0b0e7be466 SHA-1: c7126e671707ddfb83f785092853b3ef2c85d1d4 SHA-256: a5b9cc1a519ca4aff586cada9337aa6eda8dc8eff7122ae9dcd705b442449d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, some of which are associated with compromised WordPress sites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

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 https://krisoc.ru/uplcv?utm_term=happy+wheels+apk+2019 PDF link annotation
    • http://mega-treid.com/userfiles/files/zutowepojunimatuzib.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/fibupu.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lewoliwutemokemu.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/difad.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65377be77---53093957799.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wozewepupevalek.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebce004188---88742000115.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907123003.pdfIn PDF document text
    • http://halaljones.com/uploads/files/15518035347.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/xebolefujojewafojor.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/voduja.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/56408343213.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/47986901335.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ecb26a73---xoriganiwununifovafidega.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/55111347057.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/rerejajanajupujowov.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/94608800988.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/lubexafefuzejor.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/17570139284.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/24564442045.pdfIn PDF document text
    • http://vlajamo.cz/images/file/72394896508.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/pugituk.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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16816 bytes
SHA-256: 441d70ad0fc2b3902d758ff060d0fa0c1100af056fdbfb012fbbc0268e1d7940
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10580 bytes
SHA-256: c2a85bbb8ae8b36d625ddbbafbf6a6a6daa3a2565417edd4fb255e38b5867382