Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6330e10301b359…

MALICIOUS

PDF

85.9 KB Created: 2021-08-16 16:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cf2c99631de7368c77c547dc4398662 SHA-1: 38a68787b5fc5144f809918be491748f14ea1595 SHA-256: ba6330e10301b3596194ded3035b46711f38f083a94f56f9b6fa86eb1eee4419
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://presentkompaniet.com/img/content/file/32982399058.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b186da2d94---70572946826.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/83882514973.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/xojesemamojapa.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c4c436871b22afcd16102cdf3991d496/sobatorazegafexo.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rofumakeg.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b437a424b6c---tepegam.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/rilugasapef.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sikonabogixudew.pdfIn PDF document text
    • https://atrax.hr/files/fabuteminine.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5cdfac4d3---18395148106.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9be1cb87---jenaredanuzeputeserur.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/10bb53a495d7568bbb8c83c0501e0b41/18509034452.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210801004908.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/57471223711.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wapupabipekubom.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a9d11e9f---vibiwit.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e3e75d9a9---69685614320.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8eb7ejfrtr253bs8iu8rbikp4d/40041491084.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rgjfs0gap4vmfsf1np8rd6q2k7/68135405047.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/16748712821.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b4tq6of18gkuts91kuvdgrsev4/zalimaradekube.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/74455034948.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/fadaw.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/pexofoketonedevelo.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/61220213611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+17+goals+of+sustainable+developmentPDF 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 11344 bytes
SHA-256: 6b2280135a7e875257aa3fd4cdec35c7f9b941bb75f18f4a58e1262d0e8e0098
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 17556 bytes
SHA-256: 383e05a93c327b7153da0fefadba71cc73d5c2e86227651b2a88d7f69cf59c0b

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