Malicious PDF — malware analysis report

Static analysis result for SHA-256 b386890b3986a329…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 05:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a80990caaff30c0222ca5527f8bc5ebb SHA-1: 7c23a5e3fc87268942540286060aebe32f0f3a6e SHA-256: b386890b3986a3292870b8a5beb1c3938562af91697a4412ca2e6504494bd77a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous links pointing to potentially compromised websites and disposable hosting indicates a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/bofefuxobivep.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/stug06u88vf9sg3bnck95hg632/22370796957.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/banovopirav.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99342c36e6---luzeselilelewogo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607040d40cd89---nizisokebawunawojon.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba7da632ce---kotujiwexipololax.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/46502833672.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/84981916817.pdfIn PDF document text
    • http://hrudolf.com/userfiles/726935296.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///54883025409.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/nakonuduzuzaretasavup.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vokamivomeja.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/turudelivufiwomaxisa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/rubesaxafawis.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xebenaxodabot.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dgs1iv15e8fbh1hndcpaanasfg/nawexefekefawedoxekutaxi.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/kapogawuvib.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/26256672251.pdfIn PDF document text
    • http://hak-al.com/resimler/files/69848856187.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/fafiwapelilogemi.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/4656579313.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/lupazazomilenufijufomar.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8a9111d2e---33292932960.pdfIn PDF document text
    • http://xtra360.net/campannas/file/38323494965.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/74624341412.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kilawukarex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=processing+language+reference+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_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 10796 bytes
SHA-256: 5c1e9c9f05c4e7c8de5516ced6455389a2dc8a4f9940a428a9879bcfc2afec1c
font_02_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 17908 bytes
SHA-256: fadda9141722a32a23dec83b62627e834604f075149121aa28a333c0bee64fc0

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