Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1968db019ab3f3…

MALICIOUS

PDF

83.6 KB Created: 2021-06-13 10:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8bdcdd8f13e784a6ec9bb67f8c6e37a2 SHA-1: e2e50f401625b8ffa417506e21f888c2c4d2f658 SHA-256: 7e1968db019ab3f3c010c16601a598ca69cbc925c20ad83d0f4ecbc4e3f4d223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites and disposable hosting, likely serving as a link farm to redirect users to malicious content. The document body, though heavily obfuscated, contains terms like 'House flipper' and 'kuyhaa', suggesting a lure to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=house+flipper+kuyhaa PDF link annotation
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf75ba77c17---kajowebadifaxazog.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077157ba4484---tijajegogilirujuvolojib.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1566fd7898435b68743626bf631bdb74/visaravefiwotedotix.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/xiwug.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962722ede7d---55461811844.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/somurez.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c5a48f76---folozisivupuxuzesipo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6e0595bb62188f1a94e6d15db9025ad0/fufamutumuvuxarezubiwutim.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab44f3a0413---46140728486.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/426dccb4ad703641dcb2cc83eb6546c1/fevabigomusosijow.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1caa05dcfc---ruzarazepogalomavepub.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076e038e2e75---10015605380.pdfIn PDF document text
    • http://atek-ent.com/upload/file/52950366001.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900c3a792d9---61500876680.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/16560962499.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/t2vsupe88kvl3g9bj5asb3v0oo/13618129141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 5116 bytes
SHA-256: 16f592a844659d28a69b9c70022b613ffca2b12294600d1b6b59bb7b806791c1
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 11128 bytes
SHA-256: 94fd0753dd14fe97354835e1bd4c867476c1024a592d39bcfbc062d6f3e503a5