Malicious PDF — malware analysis report

Static analysis result for SHA-256 907cefeb6162e7f1…

MALICIOUS

PDF

122.5 KB Created: 2021-07-04 02:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4b9c35e071316d1605a4dc7db1dfa1de SHA-1: eb8bb49a0292f16df7cf23299d9c3015a8bbf0fb SHA-256: 907cefeb6162e7f1321e5863e83f6ee03904273226687f30676d1bcd13d76f55
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://inwebjor.ru/uplcv?utm_term=feeling+of+tightness+in+stomach+during+pregnancy PDF link annotation
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/rasewowalivigosoveta.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/97b40931912936eaf2247ff8c4de7fb4/bapasifu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/wulexokoriso.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43f5d6151---gedevovixejepovinifa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nizabesapipowatudiwa.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d04387d322e42a277d770a3961901a52/1925178993.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/80038689673.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910fb116dca---87225020903.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a7c7e544---12853577634.pdfIn PDF document text
    • http://ned.ru/uploads/files/foruvanix.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838830bbd33---tododaneloxasejitum.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gavuli.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b38947d8---lofomajukoruwor.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a033b978df7---73417648422.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160901bb770c9d---ledexibupokubu.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/lovanijemabefe.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/80210136584.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e11b0922d34cb0acc3289cb57764a9e8/vuvolezasojivizufer.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1c964633---rutimidilafaj.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/72877670073.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20c4d5932---75646967237.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/95593662167.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a9d3ce6612e736d9fbd0cda5defd8563/zagalodo.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sopapitibeduk.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/979831865.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_off00017df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF5 16936 bytes
SHA-256: ed76aff045f48236edac879e2588f50ad119c098fcbd889eeee154df8c8779e9
font_01_sfnt_off0001a9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C1 11256 bytes
SHA-256: 20cd76fb85e822822551ec40aba6792f1c6df479d685b5b995be4f078e4f37a7
font_02_sfnt_off0001c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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