Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed61828a27ebea0…

MALICIOUS

PDF

125.1 KB Created: 2021-09-02 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 39591b666369e5a9a5fc087a8860f6c6 SHA-1: d79d81de262c3d252123bd144607402acef2f760 SHA-256: 4ed61828a27ebea05239573fc33a377205e40433909bbac8f2db1a8409b2fe17
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or harvest credentials. The presence of multiple external URIs and link farms indicates a broad distribution effort, likely to trick users into clicking through to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/a5n54m1gqk61omnbp9q709dc5m/rikuremafeboxodija.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/14284e94bc53998e9e30a1e02617280e/tavimobadu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/70224531249.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fe54a29bdb9520123f82d35eb9b6eea2/dokofepunikadi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/39212f15af7fe8f5d248ae74bb43c0d0/zaxasudoj.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/aab75877ba1f9182a1bc7afc497f733d/90391466851.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/beef8eb06026d9956195895409e0fff9/51423863217.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b8f403be54738e7ea6ff831992f01e50/89014142843.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00edb778dd---66032859404.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/62274294725.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ha8c8n527blnbkibpaltepmimi/60183514628.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/wojopapugawixivub.pdfIn PDF document text
    • http://belst.by/upload/file/serikumolokudewevagivop.pdfIn PDF document text
    • http://yuhongzg.com/d/files/180507539.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/75086702034.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/353ec18182363db73db7b23c9a9124ca/1151679265.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ed1c7d1827e74d9b5991eca409463509/6418093585.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/89624618170.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161197c22ebeee---razilobejolofo.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/87463760445.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/namunetoginareworin.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/pinevizujovat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=uidai+exam+questions+in+bengali+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_off00017a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A48 21680 bytes
SHA-256: 5357aa9d2f13e1ef8439dbfbaf9e26945e827ef310e941aaa5c09610c5fe1157
font_01_sfnt_off0001b4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCC8 11236 bytes
SHA-256: 878dd5c359b6541a785f4941409df2eae286542bc3b1ccb419aff0ba97c7be5a

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