Malicious PDF — malware analysis report

Static analysis result for SHA-256 31714ce39c39e74c…

MALICIOUS

PDF

82.5 KB Created: 2021-07-09 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24ff2e28a3fc165a4d2abd74f40003b6 SHA-1: 9bcd893f9b9dbdbf76b8d5bb6664b1db344be147 SHA-256: 31714ce39c39e74c769d05a9682dad386f893c28f4703e0f9cf7439e1439f5c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=gta+san+andreas+helicopter+locations+map
    • http://ippon.lv/uploads/File/kaborixizo.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6be17badc180b7304c480e24a1f78644/zukopiva.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1c245e7d5c482f8248eb5498184a5093/wabinaxudezazu.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df45a48ca154892bc433a18bcf6c5c24/50909654662.pdf
    • http://instandee.com/Images_upload/files/munulujitoba.pdf
    • http://anshan56.cn/userfiles/file/1625611826715010610.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fc73d68c---78880252160.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440732bc03---zugulij.pdf
    • https://factinet.com/uploads/files/37753016868.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072644a170ca---29069486838.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/a5m4lrfqh9tps2b73fa38dne4j/92131730850.pdf
    • http://m3hotels.com/userfiles/file/13661059346.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cbe97fd14---zabusumex.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb74ef4fd41---raruk.pdf
    • http://www.klimavill.com//data/editorfile/67300023452.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0p11pqams1s252pl330kccvuac/51142580662.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/72d0ad01105bd1800026be3d9c0cfc04/69085618860.pdf
    • http://ozona.pt/wysiwygfiles/file/xisosaweni.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b739a56a---nurivofusinikalexewofu.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/51991057370.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa8680cfa---nesirogazarep.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b5de5476e7a90b18c6b6cfe45bda1f09/jafupoxobinogujezevirifa.pdf
    • http://www.serenissimaservizi.com//files/nibolo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
font_01_sfnt_off0000f5e2.bin
1c664d99e782ae517ebffe3deb8e07e174e8efb48705d51fefa7cc9841f2206a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 17860 bytes
font_02_sfnt_off00012429.bin
273df29d2df357ac37b382786b6ab03b8e2f27b2feb21c213cd5b99bf5b924a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 10816 bytes