Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86bba3bbeff6ca9…

MALICIOUS

PDF

81.8 KB Created: 2021-06-28 21:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64cb807e3c98089224abe25261b53714 SHA-1: 5ddeaacddeea13ffac47167c47c3c9ad4856cf7f SHA-256: d86bba3bbeff6ca93ca13cc5c06479706b8dc41f83f7d7cfd0f8dfda89b1befa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing sites or further malware delivery, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6dadd5b5---87605740885.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091052a8e995---909387013.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/sarevogemolewusifanovekej.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4f44aa4f0eedeb6307490d677bbc5429/88118926956.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b154b8c213---61247728963.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160949dd86186b---jerewosepasijomu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/domawepivajedak.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vemekor.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e148369e7---vural.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b15cde902d610f063e7bd9872c123411/79942888161.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/zekudixobatazoxovu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55df02387---bivisanovenope.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/u6d3cu7sbbqu0bq5injen28lfd/52332558439.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/77895770822.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40d75e00c---26715175539.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/68164304842.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/22108309913.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce90175b081---83918386323.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094de68b00f4---37214172758.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2157c1e7---80170391103.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ohk6gaklg2esnjf9fnc5u97n0/xisimi.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/27080433245.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/xavov.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dsr5upkt9flntvv7hu6iofpvb3/51589977720.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0f789e4a---magogupim.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/samoketezovex.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/39506913385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solicitors+practice+rulesPDF 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://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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 10440 bytes
SHA-256: 47785543d6a1fa5aed94e4d8a8c7970d1aa35a7960dbe964355fde0100cdcf18
font_02_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 17112 bytes
SHA-256: e92ce098b9e698acc147e595bd2c5f8d5e62112087285b5839f0cc6b79e3bd93

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