Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d2bd0fe9bc55c9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 02:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac14595e1da5924bfbfaa29f66b41822 SHA-1: 990eac18ed2c6acefe799834c5a96c9056818a7b SHA-256: 07d2bd0fe9bc55c9913dc9b98378681dfad791d26d2e570e640a9966270d058e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. 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 clues to its purpose beyond the presence of links.

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 http://somogroup.vn/ckfinder/userfiles/files/77906077854.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/65167211822.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cbdd7d336---71445421169.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/13749c20136438f583a1b1b5e9e0f29b/nomod.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/47044646521.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52f8e73f0---walawamitupexixirixujegos.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/99936867875.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/wanexejumizebutik.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fabuviko.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/75875867979.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///37127291834.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/rebamav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e027b840---26196169697.pdfIn PDF document text
    • http://starsunited.at/upload/files/madis.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/vupawiserawixekodapi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f4d458d4a1c92db0217cbfc2ea659aef/dukozavuwigip.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/994641607.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5c408949---78028796955.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/94605989266.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c323c78e8d2---mizojamowofepi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/pomiranadibenewezepisunuv.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/68633008035.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c50517df1---metisijix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mustee+18w+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10304 bytes
SHA-256: 9637fbb280a68e49f926cdb7c47cc311a86a109b405e01d4c6b8f9825bee90ac
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 19856 bytes
SHA-256: b83138565a7c59a27b94f0c5f3d0a820aaae5e8fbd976b30bf74fa8f31e4d3c3
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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