Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0fb08d23cb07a4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 02:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5bbdad26c42cf83c2a301c618555298 SHA-1: e3ff16104eab33ac3008950ff3aefb195da66710 SHA-256: 8f0fb08d23cb07a442488073930ef886dfa9ff5c3c9a22eae6039a311941300d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to redirect users to external, untrusted sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=first+aid+usmle+download PDF link annotation
    • http://biondiairsystem.it/userfiles/files/34948690733.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/82446094373.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/80215849900.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/ropupuvidede.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/faretemebof.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/xunimevofavutabe.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/20818372105.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9758316138.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/1703446493.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4ce6d9d3---75239307800.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/38507153305.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476a25b1c40---neletulotigu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145547f5c602---5060704479.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/woregep.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb51f524---771553590.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/25240086731.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/jober.pdfIn PDF document text
    • http://szjg.hu/images/file/41569244380.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6960dcb50---xixedezinipa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47edb87c---54689617895.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/janofutuveremow.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613af94c2f4e0---duzekebozo.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/vuwuzalexapumeri.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/bekenadelutido.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/16308777637.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_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 10572 bytes
SHA-256: 30d76cc4da0b08aade511cbcb38c8dc83e9e9ed0cdf001859a8b12363b09cfa9
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 17864 bytes
SHA-256: 56576a572f1356b20c06fa7b8c7ac0a1eb69205d6178a3073ab4661e54c8d250
font_02_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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