Malicious PDF — malware analysis report

Static analysis result for SHA-256 1031cfe9e620ead1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 05:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53e8adbeeb705b1433cc62a8b6b3a38d SHA-1: 4b2d898c233e7b06407fc5d16ea1065445313247 SHA-256: 1031cfe9e620ead1bfb6e66538790cf73148da6d230db6a5789c8779978d8a8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=best+chest+workout PDF link annotation
    • http://studioscoponi.eu/userfiles/files/76377642226.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/23718992989.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/fomomedumufap.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/35421336060.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/40626244742.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/gevenujepinap.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/75993260879.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/mabiwuxagofabaredebaf.pdfIn PDF document text
    • https://alev.az/userfiles/file/24662830022.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/jononoveritugemefad.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/26003379044.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/8920378406.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/zevelizemazowedurowili.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614233f27a151---vawomin.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/31726976242.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/30586438701.pdfIn PDF document text
    • http://accronline.com/userfiles/file/6644678091.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/79419609841.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fca4cdcdca4d0ee621e3cac171ac42ec/10752878324.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/lupimaleragifavifiwiz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6f63de12---zabitovokelarojo.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/diwusatakali.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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 10252 bytes
SHA-256: a219f78528fed6d5ef6fd56a4b4fe33adc8aa9ff1e21419389b3d214bc3acdbd
font_01_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 17480 bytes
SHA-256: a9c73c1da62101641daf572c15c5b7bc2b6d3158478d83cf83bd762c3177bacd
font_02_sfnt_off00011cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1