Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab10d2e16400c8e2…

MALICIOUS

PDF

92.9 KB Created: 2021-09-01 07:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76962df3f6461e9e0a727fb5a4cd0ac3 SHA-1: b0c0b0a947fe08e8d00e98b4938347731c607658 SHA-256: ab10d2e16400c8e27dc7d65247310b628c9afcdf4b6a7e04fd27e9640f3f5428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://magerp.org/upload/files/rexegelimonu.pdf In PDF document text
    • http://www.keizerco.nl/userFiles/file/sujanijekapafobipazade.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/minur.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/tilesu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808292077a5---34430128613.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/noganaritivel.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/68418692602.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/fabipasuwawisalakuzu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/62b4eb77db715cbd26d68ecf574b7929/16147609716.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/37068279040.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/33224935344.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/efad1e0096f61721b6e7bd1364b7b234/puxufasakufukazuvisuri.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/dalofuviborilekixuvipat.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/norerif.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/40249140970.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/22327965641.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/vituwazif.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/silomemoviriwe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d50e8f7ab---teruwolikapewuboguragusuz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e7e66f67---77073693212.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d714ade71---bimupadekowunise.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fa15febd---69907341744.pdfIn PDF document text
    • https://binhvi.com/upload/files/270580141.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6621e31a3---92440605380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=read+passion+and+purity+online+freePDF 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_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10748 bytes
SHA-256: 135f3a75ff1a0ebfa31240df33127b8fd7fb8f477816b21b5a4c015af012f5df
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 18356 bytes
SHA-256: 145066ab8a58937afba44801116d7c752d122b37d9b5b43e24e5f3f87b0915a2
font_02_sfnt_off00014cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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