Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf4b0178bbec026…

MALICIOUS

PDF

114.0 KB Created: 2021-07-02 12:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 232aa10bb693d884f97e4547caedacf3 SHA-1: 7ad8fdeef8d24ef2359d939d9dcc68f01a8416f7 SHA-256: 8bf4b0178bbec02679a7537c0ead75948a8f19e6858ff1dfa0f076f303e9dc88
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6790dd51aa2b2ed173a1eaeeadb07319/nozekatiza.pdf In PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7dd63bcc521bdbbb109ea160cf0886d5/dudabapumemiluxitege.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/4560138096.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/31054154664.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bilivegewapawagudo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/81155557523.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8e1f3d19---medojerel.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/5288736151.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084170226c41---fobumetubebunat.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33d89b403---84439644658.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/32403244623.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/80453489399.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c0571639---rulofenilebawukarad.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/51d0ed573ef7ad6dba6ad86de1a7f364/36127387358.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc486da71---javomarob.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ff34e48c35572f78e834b17197bfc54e/89242176487.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c4455366ccfad92ecc34ca43ae90b2b0/rusuju.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zesufaxedibivomapuwefo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/9ao3n4aies0e6kovj393h0kcl6/92646633042.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/rexidofazomeziwamajijogi.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kaxexaxa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/defulfe0t7uppjscgvves5da62/jekoze.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a8ef976a44eab7dbe49ed465fd7b84a0/30655666002.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d1afc452de---tusuxewixijigivajanoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=exotic+bully+puppies+for+sale+near+mePDF 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_off0001584d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17064 11080 bytes
SHA-256: 90a7c6942ece94394fcf476b8d4e6a3ae3923b338384913f2e0b786c47aac4bd
font_02_sfnt_off00018a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A07 18416 bytes
SHA-256: f9bf86eccd2e7dc8ac25e2753b15f34691a59f3785f6f3c17d261e558c3348ca

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