Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfae709dae2e66ba…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 11:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7043ba93594c77a6c83eb2630441be03 SHA-1: fa9f8cfd1bbd5bb93f3209918c8a0e988276b8a4 SHA-256: bfae709dae2e66bad34a831d1f9e5cf8f97721b9fc695f2823f5d48f0a147666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to facilitate phishing or malware distribution by directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=combat+of+hero+mod+apk PDF link annotation
    • https://investkwik.com/userfiles/file/46577959323.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/3347896929.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/19369636693.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/33220086167.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723fc3ad3a---pabitokot.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/vazimewo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3528634f70c0a08459b58687022ac836/tupev.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nerenofuzito.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311d1c10305---27706787232.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/93835815377.pdfIn PDF document text
    • http://dsraxys.com/uploads/91326025696.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/90936203358.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb5326c0a---39926908673.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/91276640826.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/14453970473.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/6635665440.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/52248562923.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fonojuzuzo.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tifiwanezujunudikusim.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903142606386920.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumiwazepit.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/74927244985.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/42556060238.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menapurabibututatedoli.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85c133542---jarilopanizu.pdfIn PDF document text
    • 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_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 17344 bytes
SHA-256: 5f6ab91d08ac831b15c8586fd347ee4ca5ceea12bf31f3692eba02fd26a48c95
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 10616 bytes
SHA-256: 055f4f83a61957e0eea1c51e64de0e62777c118263595d97b6ca57b8c5f05a37

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