Malicious PDF — malware analysis report

Static analysis result for SHA-256 e341b103cec4733a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 09:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69b3c6154c71a0c45b81d839edd9bf16 SHA-1: eef2af6ba308b50185b61069200ab8ab5de9c9d9 SHA-256: e341b103cec4733ab3503db8b114302aaaa70eac068c5579b1bd64c33396e4aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites. The presence of numerous unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed9u898osek82s4oeab8s5k6dg/61457890483.pdf In PDF document text
    • http://bobmeetin.com/media/galleries/files/buxirovuzupebubomu.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/peterazukabelakow.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/21581227583.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/vajopimotixoboxibevixus.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ehaue9irjv3nu7hmegj3j1b3l9/xepesetubon.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293d79ee62d---gikow.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161081825aa53a---kizupinoxuvukapejinulir.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/9147867678.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2cf9808eb2afd6b7e5124fc7e9ddad45/43667290054.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/saditumufam.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/79920161777.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/37767155116.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/808d51f2ae305f7a8e06940e981b1471/44347380528.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bowagokezakid.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/25341606494.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829962b795---65242754492.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608103aa61b6d---ropevonojonulik.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/65820859866.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/nexusasebuxemilebodebexe.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/segufimoxivimapazijadagu.pdfIn PDF document text
    • https://purefeeling8.com/data/file/32014329020.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608eecf8746b5---92771917772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=manual+de+cardiologia+pediatrica+pdfPDF link annotation
    • 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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10720 bytes
SHA-256: 448290dec9514e2f42dbd0d73cb09cb7824f1fd838c0298c5c5f98512645f22e
font_01_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 18596 bytes
SHA-256: f90532bcdf7d5b1b6c84a980448661528db3e99c0e5946e14f305f5bcd9d6546
font_02_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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