Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbf4a68b31dd44c…

MALICIOUS

PDF

132.2 KB Created: 2021-07-03 13:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e61a1649585a278ffd25b633a9b28694 SHA-1: 5ee870263d735b8fac509433c6f58fcc60dbfee8 SHA-256: fcbf4a68b31dd44c9bfefdb46aadf070d0199563047c4291f20d9cbe3bb7708e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=diffusion+of+water+is+called PDF link annotation
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/pekaxuruzabaziko.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/90145938070.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/bazupizuzisalaxixireno.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2972cd45f7---30743759339.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/aaae1ac907a41844fad4c0b9243f2335/mesonesodoxuzi.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/saxigubojisiwulobowajojum.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073319514113---23603901700.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7fc6c309---68876494983.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/83131333348.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccf16fadb---36447427295.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d3467c26---78408528563.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091dbddc2711---davafozatovat.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070302320226.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/pinesalukuvukatogek.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2537b2c05---folukotodofovunorara.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/davixarerejob.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad168c147cc---xoralalekitopewor.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9g4s1jhfn8d7rnj30m9dsq872d/lorufufanudawam.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/79859654046.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5976614db2c700c7fc20f9220fa44500/xakikigojedozuzuxon.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1707c102b---73944116313.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DB 10656 bytes
SHA-256: 463187e8462a8b48bfd90b452b27ee017be42eb1f004bab7e7005ce28a7a307a
font_01_sfnt_off00019c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C74 20760 bytes
SHA-256: 5bd0fc965ec5a103407614d892db9f6eefa4ea21b20cd71b33eb49bbaabb0712
font_02_sfnt_off0001d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF6 16448 bytes
SHA-256: 53b4b3b6154cf2d100ceb894d68689d6d1bd473e48c60f7608565ee63f15a623

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