Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6105c42031928e7…

MALICIOUS

PDF

95.1 KB Created: 2021-07-20 07:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78ec859e5563d3149d29cc3ec7845621 SHA-1: b8315dcf24ea7b66e83d1c6a82e48de4b50ed0c2 SHA-256: f6105c42031928e768121e35542d95c580655e920589747518c079a87fe75437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/kbm8mfndrvrp7aj2o74oj8gkh8/61041881846.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec457ecd0---tegowadilatuxobetuvuve.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609262d4be886---78142267849.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/jaxemojekam.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/gakilane.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a274cc1ae---mewalodojugoki.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/25949132865.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab5f7efc5---vizofediwunefid.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c889eefe70---84120673856.pdfIn PDF document text
    • http://prmakeup.com/Image/files/37194823719.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9d1586962940263bef9b54d0c3fe4c50/53717566583.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e5e79afbd03cd92ee2d9d823cd2ef48/bopokodotulafisa.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f58ec04c6---morome.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-30/20210630100023543941.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/05bdbeb35ebfd807d18ef213d04ddab1/78395671138.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/dudopinenadaro.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d1daf73b33d---13397994348.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/befitelupewawugopo.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/bowibupaxisivoramaratopa.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fs83315pveaiko1rolkke629b9/31262590430.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/kinutiwopo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/iq3bjprd0p24oi4966tqqnddv3/saxibopapivas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=words+that+start+with+xePDF 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_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 17608 bytes
SHA-256: fab884471d28dd3687ef4c3f09ac5b5106cbe8cf7a708d7f52d7b346ce94bef8
font_01_sfnt_off00013fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDE 10376 bytes
SHA-256: 79b8cbeeb0f8b702942d541776ae9fd63e0ba149a4849b38fe06ff45a679e463
font_02_sfnt_off00015795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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