Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d0e84f00aab15…

MALICIOUS

PDF

72.6 KB Created: 2021-06-20 14:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0823556ee233b16bba7157e2da7fef96 SHA-1: 9d41b512c9253413c8679aad695e50d504acb59b SHA-256: 809d0e84f00aab154c2a2d70ae547a0d9b7b20dd1915e15d4a9ed416ad89bb58
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artlabjo.com/userfiles/file/luxuliz.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0191adb5---55750969612.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099beaf3532b---jiviwuxolozujelitesew.pdf
    • https://juhaszautovill.hu/userfiles/file/37776728955.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9715a820891d52573425fb7a3f780a2b/56599512221.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1rgsqmghao2i2qo9t8jmvrmo41/93640302251.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qerfkq415ecqcuh734pfd0a0bh/33635570386.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2fb9575beed0bd2223e6e5c23945ce27/mudesafod.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/32878382845.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0dac3ced---35893069952.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8fba9f19---48188092411.pdf
    • http://moderncarrent.com/user_img/files/gemezododowamujewajef.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838c7302f7---41069030298.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/83185151132.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07ff0dcc0---vijozuwiwi.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b06737a060c---rovofotapekukakofurumod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+to+say+as+strengths+and+weaknesses+in+interview
    • 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_off0000def3.bin
370187dc15f4baa46ac7325ed534e5e42f0f407822c12810139bf078b819eacb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 5388 bytes
font_01_sfnt_off0000f160.bin
d69fa99e2e1e737b3b9fc5799f65f09f9b819955e6bdf2a4171339ca2e1484f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10540 bytes

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