Malicious PDF — malware analysis report

Static analysis result for SHA-256 5802bb94933bf6d1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 16:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac61182255633862183989231e4ccddd SHA-1: a09c93bf8a57c0eaf6824323401a1d62cb256f2d SHA-256: 5802bb94933bf6d1ea0bc2b27366d598fa9bcdeaaa06a5c7076b8389280d1c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with single links, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is used to host a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=digits+1+to+10 PDF link annotation
    • https://clinicaveterinariacabianca.it/file/43559008123.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/suzufepafokemaguloxus.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/86130737674.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afbb23db733d5bab135edbb9db4c6d59/70475380782.pdfIn PDF document text
    • https://cecprint.com/images/file/larenorudumaxevog.pdfIn PDF document text
    • http://wajl.net/img/file/202171401027.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/52993303969.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/rofiwiwe.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/02e07e19b31068d418f9fc07b9b18237/23587890733.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1b1de9bbdd6516ef2f0890a586423d50/dafinugopoxizixaxomop.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/45208912780.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/55512479779.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/tugakul.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/21363128115.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/38579611390.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b898ea54ca2---49055221681.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/10017415192.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8ce837m34surgou1vrlu4k5uq3/podasogagugagofogovugumi.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/74256170014.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/28699267563.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d20fd8edf---12606849234.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/68693284023.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/73544426278.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_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 17968 bytes
SHA-256: da1a0210ea169af22ac240c7d9730c234757dd509cefbdaec72c4b99e39800df
font_02_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 9916 bytes
SHA-256: 97368d627463fd23723499ac796d59fd709e3aa98be048109d076c83ff4244fe

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