Malicious PDF — malware analysis report

Static analysis result for SHA-256 1953cb3f6a21e8ec…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 22:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83b7d4630a1e1fb45eea877255239a93 SHA-1: 8c7a5bee87d9318f11724f47a1b4c86dd1c7dffb SHA-256: 1953cb3f6a21e8ec022b5f7e8ae958e102fb166fb19c3e057cb061b7e9a61346
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://webtechnocrats.com/upload/file/juwerupidovuwolodob.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160828017bbded---mugozofepozu.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/10731394445.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23911893905.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2828cef80a511f81a49b5f442d6c6617/genevetexumekofotido.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kipusegelezivove.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/lirix.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/vewajifasuvatuvikovivof.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pokizelejo.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/walosaxizegidukigus.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ca09571a989928cd55c2a417c1366d59/48659948734.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/mulebanef.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/wamadokemamex.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/fimabonudomupunixo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16108aff50177b---32174902258.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/99897424373.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d30bc92061a---wenoxupuvajilejorifisar.pdfIn PDF document text
    • http://abc-tel.ru/data/File/35461033659.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb3546408---tefoteterilivisazem.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/60962552250.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/noxikorefisexadumuwin.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-11/20210611140217311919.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202108271024277646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hoshizaki+refrigerator+hr24a+manualPDF 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 17412 bytes
SHA-256: 1c11e6d4908e17f8e063db9dffba191db207fd2dd6263246599bcef676075e39
font_02_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 11100 bytes
SHA-256: 9f0ad44e14e69b59a5751aa46e727fa657d902d1f101702651cd2914cef6288a

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