Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c9e495ea3455bf…

MALICIOUS

PDF

119.1 KB Created: 2021-07-03 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb648106a6a3e0d78a11c0d18d7a9829 SHA-1: 5aeff9b08c26063d38134e88dc95b82f24afa1c7 SHA-256: d2c9e495ea3455bf8a94dae81ca790a93644a918ffa27dc942efcdeeaef17858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. This pattern suggests an attempt to distribute malware or conduct phishing attacks by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsqb6eglnvn8jtscqkerplodh2/kofagow.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vipirozoxaxajefubod.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/293f583ba4989f28d53f662b9de79642/sakarepexikeruwir.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608af878bedb4---36257010455.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be380bd4b0f---lebidexobomizugiwusotu.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea4844d62---dagurilemagutugajudawid.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/88b2ab98a61172e5fdc0a76d3774351d/79417598668.pdf
    • http://www.aqsclimited.com/EditorImages/file/53521236600.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080754e6e065---luvoteniveja.pdf
    • http://playeasypiano.com/resources/fck_images/xuxibezanekugolizilimuza.pdf
    • http://studiodrago.eu/userfiles/files/62336024823.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/18251820495.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ce91dbe78cd8701d3b9dc64847cc01de/37604448966.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/60386893479.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/35368236501fefc2a62bee6b0507fcc9/nujesivekafarifetapipu.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/74923386888.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/41a2b208540a1352a55ef199861d7509/lejuwosavuzufusopezomu.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef806a012---53731549167.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/10clu4br96f6um7kq4akpampn2/gikoxa.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a13fdb54e476dadc13579d281beb4020/sonominiroduzol.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/37849e190b69e37d25313d8162f2660e/vurekuxogobixabidoledi.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9deaa169406941755e51a006769e9b6f/jezefanasufukixogepowuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=frequency+range+of+moving+iron+instrument
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151c7.bin
9a4c85085c17a59abdbe33e4264b7436e24d9e4e08597224a124b0c83d9fbb1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151C7 11036 bytes
font_01_sfnt_off00016b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3B 16792 bytes
font_02_sfnt_off0001834c.bin
505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1834C 16100 bytes
font_03_sfnt_off00019884.bin
e42b97ab1ae2cbbd0acbbed44a43ea12e85c83f33818ac4ae1e60dbdb82afb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19884 20276 bytes

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