Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc0653a32b68f9e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-30 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0f04ec996731f97a59a5591b1a501f7 SHA-1: 9acd025178f239332911685e3486a4ca0e9f4789 SHA-256: 7fc0653a32b68f9e7e3f063907fde026ce6778dff76904a2d24e5ecb03fa3e0c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

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://huntic.ru/uplcv?utm_term=2.0+ghz+octa+core+is+good+for+gaming PDF link annotation
    • http://1hozain.ru/files/userfiles/files/somebonuzasawej.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/75702181921.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/fitomenomawu.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/lipomixerapibada.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210919075705.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa748e3bb4---betokabopufiw.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/52932975686.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/nupejipuxemof.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/jotisu.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/83598776172.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/riridorikawu.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/senuwozajilu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/45259258974.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/jizujojoxija.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6da18056---31338750427.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/vavanupoxuxipenuj.pdfIn PDF document text
    • http://builderall.info/userfiles/file/13390240195.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/59eb95e74c453a8f0eb34d7b12ede862/futevibovilakisiruvitam.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lokoxij.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/vafamuwet.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161434e5765066---gajufuronukig.pdfIn PDF document text
    • http://hrudolf.com/userfiles/94520403563.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/gigofelazudipawit.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/rofakolunudekejikuti.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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 11148 bytes
SHA-256: 4ee4a6b91b73114f161d5314b7d3be258640225e4bd5556747d479e3fa7f3562
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 21080 bytes
SHA-256: bfbc80797358added10db7417b486a014d8a4eac360b661f7ea01a39bc06ec1a
font_02_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1