Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb276186726c3979…

MALICIOUS

PDF

83.8 KB Created: 2021-08-21 12:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2940232fba6d38621d5c0dbaf0f7d959 SHA-1: 49eea0b7dc68b5a2ca97b4b86096a1245fde8f1b SHA-256: cb276186726c397918f0df095a85bc09fe09098e55834c4b996beb808f81b2c4
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and other potentially malicious PDF files hosted on various domains. The primary attack pattern involves luring users to click these links, which likely leads to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=mark+finley+studying+together+pdf
    • http://draftingfloorplan.com/ckfinder/userfiles/files/nawanalorewolaxojoluzi.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e1f8a68b6f---64296114922.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6237bf63---dipukegiwupewigilotab.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hc8b0boa6223vvr324khvll25s/gipasopida.pdf
    • https://majorsagilekvaros.hu/uploads/file/negowasotelemuvofin.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1rp2mskfe10aqmuvq514eu5495/51198599251.pdf
    • http://lrpharmaceutical.com/upload/files/86884857238.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f529f7405d1---89510077805.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1afbed8af7---titonovodoguzu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a437a822d---filelixujakalekelup.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/40dad75c7e4ec126b66f8cb759aeca4b/petunutuluxifosi.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2804ab5c9---rifote.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/zoludofek.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/440c7efdb78092a210663f2f884e4ded/88092478533.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/n6rckq6n7gt9dl6mnq5foif9i3/juxefodusurusitutugiz.pdf
    • https://balajitutorial.com/admin/userfiles/file/97486171462.pdf
    • http://mnarch.it/userfiles/files/92803873099.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/02eadb55de419b312a2601ab9822c918/samavubojutoti.pdf
    • http://www.bluewhaleline.com/image/upload/File/98497306344.pdf
    • http://cuacuonbinhduong.com/upload/files/74004536764.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/vudolusidew.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a5da638c8b50b81e18cf5fe17c597143/razewusila.pdf
    • http://btfa.tw/upload/files/41720885989.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_off0000de9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16792 bytes
font_01_sfnt_off0000f6ad.bin
032781032412d9e8bb8416c4ad1f06cb6d8c777fce578632661a4b95a2849c88
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 18148 bytes
font_02_sfnt_off00012696.bin
7ccf16dbe4ce24b6bd56b34b547cbc319acd955da3d7d721d8788fd7694fae29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 11076 bytes