Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8080ad78cd6860…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 15:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d3d6ca29d1ec97c134f17003bd806151 SHA-1: 8461929f734613ac79517ac7eacf8ffe15c630ea SHA-256: 7c8080ad78cd6860897b2e2a5ca11c614909c7583735854a53449e06cc474969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The primary function appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=one+two+three+full+movie+download+hd+1080p PDF link annotation
    • https://bdblue.com/ckfinder/userfiles/files/30759484596.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc027766df---19694142114.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/nagemetedasa.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902142709.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/91930035231.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210907_22e75.pdfIn PDF document text
    • http://rayer.cn/d/files/33672769762.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/87680263767.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8a14bcdb---danifunimubaguvigarere.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/81626526126.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/61696864331.pdfIn PDF document text
    • http://briztravel.com/upload/files/kegaf.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/31497555584.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/5565670831.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/melekipifazozagovipif.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/sezizutebom.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/zalunosurizokiwanuj.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/36869198383.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/84634875429.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/rurumanoxivonekumoduso.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd3426c4a---52523862966.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pupuk.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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 17212 bytes
SHA-256: fe61628c1be427086380823ecf98c6260ebc217123f3bf308c349adcaa5fb6ef
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 11256 bytes
SHA-256: ffa9405fb3812d8dac0a3675fd740df6398b1d67675ed817de5c94cc861cbf36