Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83a6dda02be0693…

MALICIOUS

PDF

100.4 KB Created: 2021-06-26 01:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2ea4acd94715a05a6d7004679858f68 SHA-1: 56b73fecdbae78438d46f7b3ffa03e5f2df7706b SHA-256: a83a6dda02be06932a1de62233ca87d037b11a6b28d4ad24b6ffb2e08c5c9af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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://queure.ru/uplcv?utm_term=stone+as+measure+of+weight
    • http://aqbnb.com/uploadfile/file/49656939821.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/683516afda7c6ec84114a0422a0943b6/5321685491.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f3cfb3053e88ec7c9a968035acf4c9f8/zonezi.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5c7ac82c6f22dbb4540153d44a823b87/robone.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61ef7c7ab6a63d666f1e7526db499964/71494855881.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609282d42e43e---60614246219.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e167d01f51---kinipomarirefefolaku.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da42720b2c---79429920739.pdf
    • https://blokhol.com/upload/files/govejovo.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c321752fd1f9fa2ab3fb17fe2267c528/88124682813.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/pitexuvosivufop.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/36828209918.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/ruworikudom.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ef43131bffc89e97b74e1d208c935bfe/roviwidusuxeti.pdf
    • http://ajk-opakowania.eu/upload/fck/file/43289022710.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57dfa08f4---kugebivafatipa.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/r04599eveurrnvhodq3upp3g9b/kibazevenepag.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2989cb5180---kilaxanobifizagiwoni.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/156a9c05c3ef7220c470a8f9a20cc1be/naxaragovugef.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/5241795469.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f5972f17---46452275045.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a040650f703---42576289845.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/dc067fc9bc26cfc7f5fb028023f21709/38074771211.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1720867e0---60740226873.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nn8j4uf0epa8pdci1v64bn8s3g/jafogujuposexazotir.pdf
    • http://jp-photo.cz/soubory/files/pexozeb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac0.bin
09c9b74bef8f3cf9411bf8491969ed14b99c16855a17e28efdc198ed4c404374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 19320 bytes
font_01_sfnt_off00013c00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C00 16792 bytes
font_02_sfnt_off00015411.bin
fd24aa89c81b274dd9899e271e0c236b6169fa439c7efecc9d793792cdc8d89f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15411 16404 bytes
font_03_sfnt_off00016a8c.bin
e6bb216b12bf00f19da1549ff4a4db3c39f979d3cb1ee1d91feefa54eaabb3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8C 10876 bytes

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