Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d8cee4eb9f0d45…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 23:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6000cf92baf2ee6fd44c44676d632cee SHA-1: bbc280e33a375800206df83261fcb28cb235824c SHA-256: f5d8cee4eb9f0d455c5d80b031c984d1eed49617c934334f43439f4712e7a065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://luminex.pl/upload/file/bubudadosirumikuboba.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/jqml4tl5jr0jqejmc6nnqfasr4/77341521601.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/dalemamiwogilosewolilo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dozaresizusatekowimajoso.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/39349228440.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/11828922909.pdfIn PDF document text
    • http://hrudolf.com/userfiles/pugetu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160944a7e7e03c---wamodumevut.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vavelojijowesidabil.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cac5743f---vidumopesilimubenum.pdfIn PDF document text
    • https://dm288.com/slicice/file/tevaw.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kizipidanib.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/993a26f18c8ad5051c88afe9132cd779/23996452156.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbcd59f61---82776016651.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8d9e965792f09ee55cb202fab99a115c/rumirugoxuxaxobitujeg.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5eb5fd068dc53b533a38fcc1f77ac1d1/95909232176.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208b391eace---7155427123.pdfIn PDF document text
    • http://garderoba.sk/images/_file/73752849432.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/41274671072.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/fonawulese.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e215b6774bf---48598984253.pdfIn PDF document text
    • http://store-connector.com/_upload_bilder/_filemanager/file/dopizasiruxe.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/zuwogufofiradaxa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ua4io8km7tdn4sgvh2v637b1i0/xasunoluxedur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=honeywell+rth230b+5-2+day+programmable+thermostat+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_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 11760 bytes
SHA-256: d1b58ffb0c48ae656e70ea6503a52bb67f26905bb9d63b841cfc7d9303e356fa
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 18164 bytes
SHA-256: 73e681f752a23b7ab50a58277ac788e0912cefea11673226e5b477cb9d0ba9af

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