Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42273969ea8039e…

MALICIOUS

PDF

75.3 KB Created: 2021-07-01 22:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 574aafe524d122bd989c596804c7ec8d SHA-1: 4211e77296eed4e57be1fd44218c0f1329c6ec1a SHA-256: a42273969ea8039ef86db8edea3d42cd2c42a8aa36d1895330e2ff83711a86aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=styles+schools+and+movements+amy+dempsey+pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/33975dl8smb9ds9lj5lkkg7102/semofisas.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/506d9094275c933e63e24a243036ffc7/tijufibasademanamajera.pdf
    • http://irk-yoga.ru/upload/files/wufewupezadovav.pdf
    • http://occahomesearch.com/userfiles/files/vorurobifuvosir.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19cc72e1---kebinanadusujoteladudem.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160777f3fc4ebd---18545927564.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad28051c---pikufaxajatotel.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdc37e69b---59737792945.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ffc59cb5a---siwupa.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809368344fd---62678297431.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215202216279467.pdf
    • http://5m-tti.com/uploads/image/files/79465260649.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7737f21de1cfc69057101fb82d8d3f4f/zodilu.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/7eaae68e7035d723964d1872b1c50b5f/zukoxabosum.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae99ac05f36---fimipikonepepibeni.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cba9d1cd16b---lexajurodulejuzazusiruv.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607378a10bc9f---bojuvutepuwarobelexot.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/3d2f8e2d2b4bde8dd104657f1647491c/49676450565.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f68cbf40c---nokapijebavazozo.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/0dp1eglihj3a9hoek32gl41l3r/nisogubusotima.pdf
    • https://alpinashop.bg/files/53146047064.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d9ae94a6b2f1605cb486a9f9d588ce/58002767586.pdf
    • 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_off0000c016.bin
f68e10408c9698f709ae4bec897e706c95d7fa444a925e3581dacb71dafab2d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 17444 bytes
font_01_sfnt_off0000ec8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 16792 bytes
font_02_sfnt_off000104a5.bin
620dab3e66fa76c30a595cb1cad351f9f392af958dc263e0c92ae372fee45fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10948 bytes

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