Malicious PDF — malware analysis report

Static analysis result for SHA-256 4938f63c2b8ce8e1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 07:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fa6af9650a691dac39e470d421b5077 SHA-1: d07d0d950846f0857a55f65fc6443e74a755fd5f SHA-256: 4938f63c2b8ce8e18f155339d508d307aa837b0fe456837dc842a9016a50549d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous unknown URLs, many hosted on what appear to be compromised WordPress sites, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bepxuyenviet.com/upload/files/465024273.pdf In PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunevinefaruxuvevepa.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613323ebc4f07---43319971979.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/64354157195.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/wapopepexuvejurozi.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/bopatefaz.pdfIn PDF document text
    • http://www.520amis.com/upload/files/visetumalij.pdfIn PDF document text
    • http://krupongs.com/images/file/89454634437.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/78237876269.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/tagurogusigevimuf.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/bebobavozoxuvo.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/50328027864.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613560536617e---mowulematitavakitopupaze.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/77152627352.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/131bdaeb201baa37be9229c3e9553cbd/5588616849.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b32e79e85de2ad4da427f7c9dcfbfe17/18981884681.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/17475101303.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/86222811847.pdfIn PDF document text
    • http://ymmicro.com/files/files/mokejar.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/26346979107.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/2380401158.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/tulegeraluludisaromiba.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/marubarotodizugoriv.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/dowasanasinaxilaluzej.pdfIn PDF document text
    • http://khocabien.com/uploads/files/kiwujudawamofupotabon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=amazon+movie+app+downloadPDF 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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 17724 bytes
SHA-256: fae6982864cbcaef5790fb8cc5a8ccd82e7613f2bd1934b630d808c319c5ffb4
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 10380 bytes
SHA-256: 8abeb73d5e424cd9851215a3b3b824498b1ea929a539a17370508522d79c8fd6
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1