Malicious PDF — malware analysis report

Static analysis result for SHA-256 da60a2c81060d0e0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 16:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f804bed79c1aaa168f21ede3e5484bbb SHA-1: 88fb3e0d1477b53b5177c0652f4a990ef4d99184 SHA-256: da60a2c81060d0e083158858d9e093d0100f30e2246d7bd13988825faf44453f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=gt+500+eleanor PDF link annotation
    • http://studiotecnicodambra.eu/userfiles/files/gedujomapo.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/rugenose.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/13844630091.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/1577700730.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/9406841456.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/zofuzunev.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/lifovimusog.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/1525281369.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/midagerula.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jroqqfiqv0nnd2j7af6akt4r3r/51386877638.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce31b6e82---wiwakunamogi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ca70c1b76d5cebd439907eabf1f17adf/28092711536.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4dfdbaed8beafd783283d672b4a0f5aa/zafidapuvubar.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/wemijeziburuweleruvaju.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06cf97e5078fcf3e0c5d5f8c2a9b0917/tupexesapimotana.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/rezesufegizodawodakafazi.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/99428868379.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/52b78cd7a382d30e3765feb5c0d363cb/dokupu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/moxizagoruj.pdfIn PDF document text
    • http://actinq.nl/upload/file/winudoxola.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mejezizozuk.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/5127830252.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rifonunupu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • 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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 18392 bytes
SHA-256: b897200c1e62d00a56d84959bec891e82cef41b871c8f4b60195390da25509c6
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 10136 bytes
SHA-256: 8fa177cfdc7acd603b6ff4188030fda797e91c160e7e243fbe4d69825f7efa9c