Malicious PDF — malware analysis report

Static analysis result for SHA-256 232198d8a3470e8d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 02:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 312554a5247ffb77b7e1a0d7c1926866 SHA-1: d9658a1b397f981c4b8b1783de8689659d752053 SHA-256: 232198d8a3470e8ddb463470e2d69cf7f78b6146f875b2b542268c3c7a5ae229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external websites, some of which are hosted on compromised CMS uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the PDF is designed to distribute traffic to potentially malicious or phishing sites. No scripts were extracted, but the extensive list of URLs indicates a primary function of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=cariotipo+del+sindrome+de+klinefelter+pdf PDF link annotation
    • https://edcasys.com/ci/userfiles/files/35316107597.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/dakazalovudiwati.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d968c792---95103711985.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/bexebogikimanimivaxaxi.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/48548126585.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/gemetosotifamij.pdfIn PDF document text
    • http://polkovnik.su/upload/file/gabizopiwugilabofajigid.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f244d14f2---60015810770.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8f695ad993118c18a7c1ff2e4a44bb70/12249674745.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/diledij.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328f9f3e8b---jopoxotemob.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8e224abe---54122656538.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/70e3dd1f79ffae519e6f0582293fdaaa/66002458483.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f1c09990b8c56a946ba5c739ac236d/98877194978.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3090183d---7052260172.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/kiviruxelopamozufilinog.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/busexuzenuwuxumib.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d44195316---jajowobudufugepuz.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/50002621424.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/lazoxunemeva.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/88116123510.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/88336436460.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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10780 bytes
SHA-256: b61f3d22f5196a3271074a6727da73f63f3ec8f7b7640cd19422140e64fd965a
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 19840 bytes
SHA-256: 71d00ad620fbb758273aacfc3e837c05daf07219c897cbe3c2ab59d6061cef14
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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