Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f94fcf33207fe8…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 18:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59b8eca77bc6a615701b1555a3352a12 SHA-1: e10962479902a8ca243c2a34ce4355b06f997fca SHA-256: 33f94fcf33207fe8e19e7fca5d9fa2115421b9b65de31383def27824706552f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, 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 URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3b45548ea8037db6dbd6ba8714921a91/duroridikeb.pdf In PDF document text
    • https://netlandschool.cl/files/20203844852.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1n1njvf0orbku5n1k23quei6kb/75125900504.pdfIn PDF document text
    • https://datawire.gr/files/files/90029332660.pdfIn PDF document text
    • http://canadianrockies.info/files/file/2620440113.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/69113023259.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/jalez.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/93795787484.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/30984139449.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lavilamokezufasotoxesejun.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210901165710.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/21848031000.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0kt6ok64thbpp4gh25mk9fdq9v/soselaridiseteruziluz.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/bupisomupaguvejemimonu.pdfIn PDF document text
    • http://keacg.com/upload/files/risexafozozogipif.pdfIn PDF document text
    • http://hueide.com/upload/files/84195626280.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/bapivekipewu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xewupivetovokefumokelofo.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fojejasukuxivawanulesigir.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/varutunapexakokedata.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/91946351578.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffffba4b45f2d05d07bd8ecbc07928ba/91547736333.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/41678235334.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/37450412517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fables+choisies+de+la+fontaine+pdfPDF 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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 10732 bytes
SHA-256: a33601615ed9b806acbfd9317006685f83648e629932034266c9d8c3e057026f
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 20380 bytes
SHA-256: d3575df3aff4cf0cde3cb6d972a4847b903db54132fd56003878c2c01fa0599d
font_02_sfnt_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1