Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b47d654a3a56f8…

MALICIOUS

PDF

106.3 KB Created: 2021-06-28 15:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57cc574970ba8a3dfcaec9ed8e827024 SHA-1: 5f58234a992179564f990c4487d22f3acd26104c SHA-256: a9b47d654a3a56f89c54e606ee4d0c31c43cf25c531ccc55aa1d225a63e2b20d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly identify its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097cca39f10f---34457994838.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/70107318198.pdfIn PDF document text
    • http://nensi.si/upload/file/gusobazerodikamew.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/30618356558.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/o925c82b0h9vhu7o9sdh9ssarn/simapawinobofogezatupaxe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c75986407---83014522737.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f52e63a7---62261597232.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63c413e63---jizopike.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608340f07f218---18451521471.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756021a3086---vikaxagaladavuze.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/54030129107.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/27962677058.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/69241200479.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zamofewurixifuxakimuw.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/45399537762.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cee6768b0dccd87a1fc3048543e9a352/ginusozopitovaboj.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb548b9f9---89976775549.pdfIn PDF document text
    • http://dnepropress.net/files/file/regaxap.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bg62jl719hde2stavfot2105np/86970541764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=general+steady+flow+energy+equationPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 19540 bytes
SHA-256: f007779cde1102c4d7eafcf25c93caa3c76ef3cfd4dddd56527c101f37901d23
font_01_sfnt_off00015402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15402 11012 bytes
SHA-256: d89d5de9a7020009f7392a08698f3a786b13bdf00790532672511abb00c55ec9
font_02_sfnt_off00016d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001856d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1856D 16456 bytes
SHA-256: b567351d8817b452d7c2fb9a0144519bfd530866bceb2805c1f9ef2299257e42

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