Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fcb8002301e22c…

MALICIOUS

PDF

93.6 KB Created: 2021-08-12 14:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07791de5cc7a9c56b40df44fc159cc59 SHA-1: 4944614c61a528f2699d7b28b12c4272d7e6f510 SHA-256: 33fcb8002301e22c5d5f26accbe7c23862b3ed26317dc93273b31bf43135ed52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://erdenet.mn/userfiles/file/51851684532.pdf In PDF document text
    • https://aimhc.com/userfiles/file/87238547599.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fibeminosukurizomenurizum.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/43186112398.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bcfbdca9---mebigunejegemazikuba.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/87985466261.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/savubikazifabuzokov.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ac2e3059e---wagozedivawofatuxo.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/lezakepokazawududixagid.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6eacd9---xegurudowagazepul.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc414770c---kusunodadotatizikogoke.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/wuwiw.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/fadipem.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a2e14497---80005695897.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae43a8f4e78c5a53bbbb3a3450433d51/patesigijevakovesadujot.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077c687d9fc1---gexowuvabesujevezegurek.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/32324085095.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b53d3b99---39585730122.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/sidemero.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5a80d434---15048850903.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/88172484703.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/nedome.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/bikewogofagezar.pdfIn PDF document text
    • http://charivne.info/images/file/97085948627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+get+medicare+to+pay+for+shoesPDF 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_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 17256 bytes
SHA-256: 036421f0060e1422317015af4737330e186e4078b346c5ed12d03cff37c9512b
font_01_sfnt_off00013607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1E 11108 bytes
SHA-256: a049caabc115494724e3040cd8cda05e60f1de44efe7676030ee17f812b6c41c

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