Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb8aa0c35063b9c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 21:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25658aa80e7440a2f12de39fc516a5ac SHA-1: 02a709946b0ec476598fd5bdcd6ef4f9ba2c3aac SHA-256: 8bb8aa0c35063b9c720ca775e1a09bb412f21b8167ddd7d38953e67667ecc76a
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, likely to host or redirect to further malicious content. The presence of a 'download button' lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://clinicaveterinariasangiacomo.it/userfiles/files/95500520071.pdf In PDF document text
    • http://cellesekorea.com/ckupload/files/nedazopanetubibewa.pdfIn PDF document text
    • http://mobiliteit.nu/files/kuxifosile.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a10b5a521d39854ed9349c78a363907e/wobim.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/31005288371.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/10909600252.pdfIn PDF document text
    • http://jarosi.hu/files/file/dofexituxinijiwedora.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/46722134108.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/vifagupovanewoxopewof.pdfIn PDF document text
    • https://phm.vn/upload/files/32591383939.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/xegetevepidaruzamugezuzo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161302c988f644---pokinozarizukidalepip.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/mamazobozunojakepawume.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/48147097156.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bimulufog.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/77313789849.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/kezosikuxukakuxujozobu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207001208f---zexoruxigutarajiv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70652547521.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/58084815036.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/kivedikonawulisepavax.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/09bm1704k4gfevppbop9jamvi3/73827892002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=prince+of+persia+2008+game+download+for+pcPDF 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_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 11400 bytes
SHA-256: d87a2f77433a2a9a44ce1c28c1a23603fe0ec7095b3b361b928c85dbde9cbf6e
font_02_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 16304 bytes
SHA-256: da44f562c935a20af6794ab955d11171f6eeaa4aeddc5b896133b244a4d7c633

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