Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be3927c859b7ab7…

MALICIOUS

PDF

95.2 KB Created: 2021-09-17 02:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e08011c3d5928b8dc02c9339a99711f SHA-1: 8068aa1b148953a878569e4ff15e4b050d53acce SHA-256: 0be3927c859b7ab7bdd92519bc658dc8df4f9d25adb6c800093095c2d681c1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs. The presence of numerous embedded URLs, many hosted on compromised CMS upload storage, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=watch+game+of+thrones+online+free+putlockers PDF link annotation
    • https://alariel.be/userfiles/file/7530409771.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142433167217---34472816688.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/48173261093.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210917064347.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52bf9101c---xonofidixezojoxakiw.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ntphnunlikohosc83leb2fl3b2/jajexusanapobusozu.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kilawofufijidavixuwujas.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b1d87edab3706a073239b4c0cbbb9b10/71335014348.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vatopekakubezigaf.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/jizenisupuradiwigemed.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/xonixefe.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fuwebilelikusomanun.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2fdd37e3---41465668857.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210914_6508E551C51AA8E7.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ab639e---51877312914.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/mofozirelirilapiruvojan.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/81360366069.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/gunuparib.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/84832451676.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/fisajipabumoruromofil.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nonefulivajerufe.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/mewelapubojisizarod.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_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 11112 bytes
SHA-256: afc890d800b95b1f6173e6b7c7a6e76da209de4e4e582f20f3689108bed336b0
font_02_sfnt_off00013d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D26 19192 bytes
SHA-256: d0c8c77079cb8d166d7b545681c6e900dd53a0828e6ebf3f8b14ccc7c346f979

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