Malicious PDF — malware analysis report

Static analysis result for SHA-256 252f1b1d50e62da6…

MALICIOUS

PDF

80.7 KB Created: 2021-08-01 05:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b75222f116180a61b237d864396191ad SHA-1: 6c9bcd98961494f697b5ce53a81cc982460c24e0 SHA-256: 252f1b1d50e62da6cefefbf02f5483b53dbc3d8df8ee50cc23c77d3faee22515
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's designed to lead users to malicious content or exploit kits. The presence of multiple external URIs and a link farm structure indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://highendschmiede.de/highendfiles/file/ruvutiwux.pdf
    • https://akapacha.com/userfiles/file/rotivixezivipo.pdf
    • http://www.allatpatikapecs.hu/images/file/gikisisirofezovafaw.pdf
    • http://konemara.hu/userfiles/file/wosexogonag.pdf
    • http://phutunggiahungoto.com/uploads/files/4441017450.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/nujozunexelekareze.pdf
    • http://sharise.net/Uploadfiles/files/jasexenokuv.pdf
    • http://learnazia.com/fck/imagesfile/42718408181.pdf
    • http://accessiblevehicleservices.com/userfiles/file/titituxoleruwaxalob.pdf
    • http://esoftland.com/userfiles/file/pibegewe.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c057d1853---71238966753.pdf
    • http://jjmcp.jp/userfiles/Image/file/jenafinugomamimomir.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6e1870sguu71b68rkec1fj2jod/mavijojiz.pdf
    • https://celebicatering.com/upload/ckfinder/files/lugutukeju.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c403560bb6a---tixegazitedepew.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b254fac0bc---42957340279.pdf
    • https://samavetpharm.com/userfiles/files/21530220162.pdf
    • https://kocarbon.vn/luutru/files/bufamuxusix.pdf
    • http://ahsaipu.com/v15/Upload/file/202151953248871.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a331af15e40---vaxol.pdf
    • http://jinanxintiandi.com/userfiles/files/xuragogotenebe.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e972d3679198b224e5b0dfe558fffb54/33331920489.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2d90ff4e---gijaxeditetetase.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stephen+covey+7+habits+summary+ppt
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87b.bin
fa0974b319924e9f971ba65e6e9feb2f69ba6677b8716c489ce26bb550ba3c04
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16288 bytes
font_01_sfnt_off0001029c.bin
4fb7a8078df7ced8d1268e42728a9069e89806b50e7ce79b1d161fdae1d9cda2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 11140 bytes
font_02_sfnt_off00011c4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes