Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aff80972c3d0cd…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 06:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f6234aa93928c12743a6fd8be24ec7c SHA-1: f158a2928c84eb4de22b41571fe0a47f3943e6d4 SHA-256: 73aff80972c3d0cd94a8c2a2f80a1bb2ea31e9487e21ab97783de936805ee60a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=gta+sa+new+map+mod PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d05816915---kanepigusurugibuberuga.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/13704751139.pdfIn PDF document text
    • https://flyags.com/editorResources/file///waxapupepidusegamasegobes.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/giwevegivopiwoxefinewewib.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/75013c484debb57582cf5c7459445e6d/1464721523.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/54970450674.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff76e3ac22---belalegexadowomataw.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/96005371854.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/80670417474.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/vivanufiluwonivalasatuk.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xokakulusaxum.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/viwibupeba.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/33729413925.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pisosarefiwejugedo.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/97625223056.pdfIn PDF document text
    • http://stefani.cz/fck/file/50664576471.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/wojonesezopoj.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/tilanubedapoxolidasax.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83a5d9a57---16943267257.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jawenazimuf.pdfIn PDF document text
    • https://limadelimon.com/images/file/79041103427.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/kujosove.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 10440 bytes
SHA-256: 9a889a1dd04f526bca4bb27d0eb36a2f16ef93675b74668da1b37a939c9a5b53
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 18208 bytes
SHA-256: f431469218309e30dfb0818904f23dd176ae4c49e5472a6fbe25d5ede1809076
font_02_sfnt_off00012de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1