Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa36374a53ced244…

MALICIOUS

PDF

84.7 KB Created: 2021-08-18 11:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 632e37de89c3a641e66cb7284add95ab SHA-1: 85dd1bd310619b3c63ac0dcd5ca7cebb6a1848f8 SHA-256: aa36374a53ced2442b28d63bb08d35029243cbfd7a3d042e53c0c941afe1bbdd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://presssimayeshahr.ir/pic/file/xirajuxovuwo.pdf In PDF document text
    • http://lamexmarket.com/uploads/files/vusezotaxotuk.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6086a0e40---24656007868.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e5b5f3d98fdd701a749a8da5a333d95/31656998612.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/37265161803.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21e0ba7e000e8a03ee4f00358f73cc68/18325281541.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/30862115325.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca303ae94a---buwotikukikulena.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/4859417646.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88006184384.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sevilodiwuvo.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/lapobu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5mothmsp8it88n3f660ldj0bhj/rakul.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8000d8d35858c50eff637f268a9c0548/43025973683.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/29107329066.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0c90aee1c7c54be6e020a4e856570dd9/favagubutubuj.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3df82fa6c32a1183adfcfe0d39617f36/fekimanojedef.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/8349389943.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/62615028632.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160946dfe804c0---88391119365.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/26644592685.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cf370acd33329f4beae3cbbc405b2604/86237396656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=so%C3%A3+ar+que+se+caen+los+dientes+y+muelas+con+sangrePDF 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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 11416 bytes
SHA-256: aae043886808c73446820a0a052b1b3c10ac104399d46b00f2d4b797b15b16b9
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 17548 bytes
SHA-256: a76a48193fe6c59b8b72c9fc48a899388c9ca0c93162377192346042cd3f72a5

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