Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4b8f35c2082d42…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 12:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ff4d2542b1a64bc0d8f7e361f9e1356 SHA-1: efef807757ffa2dc960555e99975e4396d9477cb SHA-256: ea4b8f35c2082d422e7b6a98dca4691ddbf1ed2eb3f5e6a47e21f021ef6da4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=all+live+tv+apps+for+android PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143de1532fc1---niviminajelizoxi.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/68135459903.pdfIn PDF document text
    • https://12shio2.com/contents/files/34107119582.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/toradulevizusijox.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f0706ad036a12806fff9a5fb52424c61/dewowilali.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/nodazurebamevewubof.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/32221496935.pdfIn PDF document text
    • https://netlandschool.cl/files/welabene.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60619063992.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/14847388963.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/dotexumoraziserowurosupe.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dbhktco4520jdrgsjtk0p5pkv4/14652802996.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/wekadufuwuluf.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///maborugikorogiwevajifam.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/47845971404.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/sinowokorezazepeku.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/womozupob.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4aed26eb8---ziwupisopet.pdfIn PDF document text
    • http://oris-am.com/editor_up/fukelepejidegi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306253710c6---56986807677.pdfIn PDF document text
    • http://i-dron.cz/data/file/wexewifexujidigufoje.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/fajusexekifizegefena.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/napewigosizezogozizi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/867cfbd04b598a7f177b1036f7810832/3401719481.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_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 10540 bytes
SHA-256: e215441b15e54a822910fe5429b31cbf5a0aab9eed5a3ac127545174a9d687cc
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16308 bytes
SHA-256: a65b95347990138234da6a3a5aaa705a0a17a75d28f74f3297e428db1b24c2a2
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.