Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ca05fac81bd1d1…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 11:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf511a8936386166dc830d5a36de718d SHA-1: d350925db25be0f137c1e54e0b59f964e2c2de1e SHA-256: 71ca05fac81bd1d18a8deea52cf530c071adec9ceae2ca0d2954bd835721e37b
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 contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://bobecoingatlan.com/uploads/editor/file/9174795432.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/puzijes.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be87551b215---27872730776.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6b2450cdeb7673ea3becafea88e278f3/powumozasipesotesonog.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba77cde268---vapadazumamejirijetazu.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac4253ca5---pupulonadubezerunuso.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/83508979215.pdf
    • http://crescentcarpets.com/userfiles/file/mavetamaralemosalirilaz.pdf
    • http://www.aqsclimited.com/EditorImages/file/kajalodutope.pdf
    • http://caratow.eu/userfiles/file/furimozonowakugesikuzit.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/72ecebc7fa4356e820522bb602af397f/wusijetovubakaruf.pdf
    • https://balajitutorial.com/admin/userfiles/file/jezazas.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed491e6aa6---73157394346.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8b3e00ee7ed83a5b067da129d16a0551/17543712882.pdf
    • http://bezagsecurity.cz/userfiles/daxesejevasenarom.pdf
    • http://rudolphi.nu/userfiles/file/35294658863.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ec1f3b885---79836078725.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f9e0ee81---pisil.pdf
    • https://jackyrouxmethode.com/userfiles/file/58264868423.pdf
    • http://dainichiji.com/upload_ckr/files/4996850383.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ceb26864---folanoxidameranozekodir.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0c64a4dab684c3be5788be16c77dc24a/sabipe.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a29ad5671---pewefogodumorufixela.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784dd60f46c---61901793469.pdf
    • http://chinalabware.es/d/files/rufiwipijutozamegikujoka.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/569fa2805200414e9af2e0b81773eab8/71538179770.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+chili+dog+in+the+world
    • 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_off0000efa5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
font_01_sfnt_off000107bc.bin
2045fe5c70eb09c68f8f5b4721e0ed8cdc93abb3dfa2f9b4196154c250b7dff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 10628 bytes
font_02_sfnt_off00011fd5.bin
55ccb5e0997320399b6f011e87f1e0d8fe121f7af1bfa09c55a46ccdda6bd2be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16748 bytes