Malicious PDF — malware analysis report

Static analysis result for SHA-256 2993971758876a21…

MALICIOUS

PDF

70.3 KB Created: 2021-06-25 00:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02a92d33c265965ceaf519e24568ebc6 SHA-1: a97f96edb39feceaacbbfd3e299ae3bd1b608420 SHA-256: 2993971758876a21d60b62c4fcac2ec1ecc411f5f75ca6ff249667284cc08571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'service manual', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=kenwood+tr+751a+service+manual
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0546186f7---33185607042.pdf
    • https://marljivo.hr/UserFiles/files/xavam.pdf
    • https://tanthuantelecom.com/upload/fck/file/54606640016.pdf
    • http://myphammonly.com/luutru/files/mitofakidonezelulasuvo.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f0qagh1sjldpq2f69tecq9e6q/24534195218.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b44fa94a4f5---60726372762.pdf
    • https://aydin-elektrik.com/resimler/files/zakawela.pdf
    • https://vandolderskb.com/images/usr/vutadobovukifotidubog.pdf
    • https://hkbca.org/UploadFiles/file/20210523181523103.pdf
    • http://ascensionchina.com/userfiles/file/11683917794.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f60dde13---50330348062.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9flb7n5df7jf9oh1n0abut6414/jepowigetegusoruxadapupe.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4864314104049434f6273a0de99cd67a/kakip.pdf
    • https://anfauglir.com/images/file/39682591032.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2825cad63a---9906330369.pdf
    • http://tipsclubcr.com/campannas/file/faxefusitelafelum.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832dc3b1f0---95922100946.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7d989e51bf3cfdd3eb5275799a58afb7/givosopemepir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b7.bin
bd32e4a3d424fa15aedc80b1109237fcefe05df046e819e7499f5d4748169762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 5464 bytes
font_01_sfnt_off0000e660.bin
ebf43ae74804dfcdbc466012b8a75470fbaf2ba9f3ba17e08de6c8b78ea5f98d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 11156 bytes

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