Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfffbe80bdc5ca7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 03:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03cb11db5a7ffb62fe3863c61ba355e2 SHA-1: c2251393d8132daa4de49d71507f725ad3747396 SHA-256: 3bfffbe80bdc5ca776ea85b7eb98fe948c42733cb3d1005203019bd6a822408d
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of numerous suspicious URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://fra2ange.it/userfiles/files/32128731620.pdf In PDF document text
    • https://s-h.cc/uploads/files/202108300546338083.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/87664026745.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/70254224710.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/bumusemif.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///55771506259.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-31-04-51-32-59.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b34b5091aedfbf58e5fb2d31826168f1/81422800954.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b533b622287c1de370b9c4c7772ccbfc/62190221654.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/23798553006.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e779cd2b7---34208851874.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/ripaluvutukotefiminos.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/39528229439.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/juxizebafot.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/1698530051.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a87a77d0---zezokomiwanik.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/20681621205.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf0a33c6e8---bejazuwekukex.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62375384035.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/27614352132.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fuviwagijojitotisanat.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efb4c9746---59279327487.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/taguwugubonebusalavivopex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=arbitrage-free+svi+volatility+surfaces+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_off0000b9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 11124 bytes
SHA-256: 8537cd6a08e2fd4ce1a94d08e2e6e6708daf0f0cf1d2b3967ab22d89ebd8e383
font_02_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16516 bytes
SHA-256: c9111b9a4800b3319fc402782db236272bfd53a209699f961296971e18f0b830

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