Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d00c8647b5e30f3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 06:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 99917da3d695cd7c3d9998757c9c6d71 SHA-1: a9b186aa4589ab7e601bcc685766720fce4e3998 SHA-256: 2d00c8647b5e30f357935cee60bb32b00638237c8363b157d3c9877aa830eef2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://archism.ru/uplcv?utm_term=root+nook+hd PDF link annotation
    • https://i-intelli.com/ckfinder/userfiles/files/lexakudizevekikajapowos.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/siwiworixejemadiguwabo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040302212278.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gdp0vlv6fqfasmb3v0kdh7i6g3/50551717518.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/96527244518.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915c7c2170---fabuzujofi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131852e68a22---wefir.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091109514373499.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5669294a5ff68997b082952f0fec2ac4/44417412293.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///pigivojatasovoda.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/koduwufopilorovejeguru.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210903105834.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/11690294149.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jifatimisowufa.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/27708005492.pdfIn PDF document text
    • http://snft.ro/media/file/42179968439.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/mudukarezofelu.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/jeludufafidufuwi.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/wuvemofokakuvosisolagap.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/wizudidodo.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/64675809537.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_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 9780 bytes
SHA-256: bc86176f767eac5f2515a413a6a3ba9ff47c2077b5820202bf2c8746dda42f34
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 17708 bytes
SHA-256: 520f7140f1c683ef784cb3df6e1a5f30197934e266467e378ce39da424b5eb56
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1