Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fa5356a08842d2…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 18:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e098f57731cda39f68940b8affccab42 SHA-1: 7226b49d752904069654156c59e1cd4ab3ce735e SHA-256: d6fa5356a08842d2662b5a5a5a37c255a447f1c6cd2b8f0a56c4fa4345c5af73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a malicious intent to distribute further malware or phish users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=tracing+shape+worksheets PDF link annotation
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/41ab33dcaca584f54de0f22d84169e82/69982876317.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/66379915468.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tojagupemejarijonikuxil.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/zisitujamasaxomuvikuxe.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/42204179812.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc2fb68893---40965233581.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e576eee4e8---menopepozeviv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbffcaab2---45034951230.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10608a4061---vunufirizoxaredivotaneg.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/81168361519.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c679aa60bd7e05d2b49c62fb0b2507b9/vozigesedu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/nenulunuw.pdfIn PDF document text
    • http://yoron.net/up/files/xevewize.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607154d9bf673---tomilepoweruwerowur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338179d2ad---95280411621.pdfIn PDF document text
    • http://amdind.com/userfiles/file/50527777449.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zoponadetizavadudobupiju.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0a8bb25e985c5f267d34812e13c370c1/rulijiginesagedino.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/26976bdd1e76c69d61065f7d0a9361f8/paremupijatisuwamadabis.pdfIn PDF document text
    • http://allycatering.com/userfiles/49396634559.pdfIn PDF document text
    • 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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16356 bytes
SHA-256: 58e3b6baa8a6cae7c4d224a7098e6b9d92868241e7cc2d3d9f4c9532f0271de3
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 10748 bytes
SHA-256: 40d914803cb16b8ede360b6c097fa214b2432c011d4b2d050844ef70033027e4

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