Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e4d93fa98a5497…

MALICIOUS

PDF

86.5 KB Created: 2021-08-21 12:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 38df645bc49202e97a8303ebf698caca SHA-1: 0b2836c45f30cbe2f08758132d5d0d4bb84d8faf SHA-256: 54e4d93fa98a549754d28c63be057aacb5ca950a25d6cbbed61bad6c10f76270
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into obtaining a password for a separate archive, which likely contains the actual malware. Numerous URLs pointing to potentially compromised sites or link farms are present, serving as lures for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=gba_bios.bin+%2816384+bytes+large+md5sum+a860e8c0b6d573d191e4ec7db1b1e4f6%29 PDF link annotation
    • https://fanaf.com/article_ressources/file/74664124723.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b58863382---gukajesutozegaxebifosug.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d515c69a7c4---sefijarudataronumitojawog.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/wewalemesatawilopokerex.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zajurizogitigut.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c6528418---68427524530.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/72b404279bcaa40e294a45e6f01f7ccc/28558460338.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4v470di59um1e1iklmcp2jhpd7/89612860113.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/22402264642.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b56473973---94703934260.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf561b024a5---90709796702.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/un9jmcov3c6to980b2pgn7ocja/96049493267.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/rubisosekukimovovate.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/fukokajesuvap.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/xunomujaliv.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/040b6041ffa8830a71c862b494a88981/zitanupevuv.pdfIn PDF document text
    • http://charivne.info/images/file/tibofokegojerideg.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sulenumevozudaxepijagan.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/49b6ea55ec8596369300382cae7e8b90/fivulaselumofuzojixudenol.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021070606440173499.pdfIn PDF document text
    • http://cascad-trans.ru/files/6612951192.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7e9639e5f---46585819381.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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 12616 bytes
SHA-256: 3247c05821c0a6f2df3520235ca190ee2766c9ff195b14d721bd255aeeec0b4f
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 17784 bytes
SHA-256: e8c136fd79aa25e50298c5b85bf238a66c161d1ecef32bdc7c0deec5dea0752e
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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