Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d8b7681c66d07b…

MALICIOUS

PDF

82.3 KB Created: 2021-08-22 00:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd6225f98cd5bad0fea351fe971d2819 SHA-1: 712f670eb5c79ad7e19b7564b638addcefc0d3fa SHA-256: 26d8b7681c66d07b725e6639cfd4335c6791c22fd6cea9c373a28989f86d61a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=converting+metric+units+cross+number+worksheet+answers+pdf PDF link annotation
    • https://pmms-online.com/assets/file/3307404041.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/i7t6fv22aia2ldthqvu0jcf2r0/38224924637.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160762496e9c80---xefefi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba280186a64---37128183924.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/39764426901.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/s0fgokf0bgf6ng86277snn566l/suposadavufazadifoxomilew.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/23989916367.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/givutamegezejem.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/posigogujiverodot.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pikunapijusanidubugomo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/68362058621.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/68422657843.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dutapuj.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1844f9740ca0a7f5af73610f57dca526/sedul.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/90046232182.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zileted.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c594edf2a3b---wuxewetuxepizuluk.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9021812427.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6pd3t8lfhd75k3ifgp9nvgua2/kosegakulasigunokaputi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bupiloban.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/12515260656.pdfIn PDF document text
    • http://ellev.fr/upload/files/54580492420.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motuzezikegiw.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/vosudanivip.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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 11536 bytes
SHA-256: b540a7fc5048d451ae0d1b6999ee6d960cc86d928cad8c74e33c9b8ff0eb1c0f
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 16712 bytes
SHA-256: fd56525f722c2d210790d2ad0d8116244e2c7fe4c5135895fc2a2510077242b4
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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