Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b0c3fc3791c236…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 00:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdedd789dd7e8b86e77892b8feabfe33 SHA-1: 333a64363099b3c346a46ca5a8e351d6487bade1 SHA-256: b0b0c3fc3791c236457e72f703c2a846a62396f7314cef4ee0063ad5c8a97093
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on compromised CMS uploads and disposable domains, likely to distribute further malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest potential for embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://lycee-elm.org/userfiles/file/90325986002.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdab206db7---60021261262.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/furakebesim.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/53154011792.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/kekixibizekiximoxi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba3131908---74234114219.pdfIn PDF document text
    • https://network-italia.it/file/7178023162.pdfIn PDF document text
    • http://devveb.net/userfiles/file/jotixifox.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756976a904---36544573132.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/22128206575.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c663ad5d6cd---zisosuwawutoligufosiju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d18fe25d2.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/24341297815.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/33668152593.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/topuxefepuzivi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/83196266398.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c168af1a37f---luwuwisuvubaxoxolumitidab.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/8404804094.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11e6b3c0f5---zunusibodidibole.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608676347f0c6---77076370230.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/midejodetopuwunudanatok.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/97c7292b64f3bf6e7b17f372819e399d/xidupaku.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/mujel.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/lomuxuvuzamusedutekexasog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=100+qt+to+gallonsPDF link annotation
    • 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_off0000bc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 10184 bytes
SHA-256: f53b582c18b91e6a1ca6748fd0d1ae991baf8e78cb5c2027f87f47be29cf4a75
font_02_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 15516 bytes
SHA-256: f43740cbf14e9831db5846ad6e4d421ab14c5442b9c816eeee57f2806a0013d1

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