Malicious PDF — malware analysis report

Static analysis result for SHA-256 b649f962256dd91b…

MALICIOUS

PDF

78.4 KB Created: 2021-08-11 12:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 222884467c65d60ae19ae584ca38caf2 SHA-1: 1fe1b6df75c33831c5b04ec0a035e6e9315b650c SHA-256: b649f962256dd91b9ca3b871a1aaef005785da12bb3f0b014a0278b0950d4878
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous embedded URLs that point to potentially compromised websites or hosting for malicious content. The primary purpose appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crysiq.ru/uplcv?utm_term=geronimo+stilton+kingdom+of+fantasy+12+pdf PDF link annotation
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e57b2deb3---sasoramiviwasowuva.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/19087276961.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/sovabuz.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/94639527695.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/62da5c6f2834d3a44123fa5f67ec7d6d/zilutunek.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/lowijawiwilepilil.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b367043ff8c---55925295985.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6epljhh1kqg3d5omlso8euae2m/rufawovosutabuze.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/93949581316.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160889e463c2e2---67551161551.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mumorufodidemet.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b6b65d119---perofutezibibol.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/uenjlun0ugr5fgb7th79426ui1/fazuroxukadavajevakirelel.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/guger.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nc7qn8cdmf6c8qesrol7o6o7lo/47404267554.pdfIn PDF document text
    • http://attlas.center/userfiles/file/nolimetiwexijuvudov.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/namuretefukejat.pdfIn PDF document text
    • https://proxus.nl/file/papug.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tiwetikozixonuwariwimiwox.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/bizud.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a4227316---fanox.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/kajufus.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/45965220132.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_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 11256 bytes
SHA-256: acbf3618ab46d582631c0b009475e8b70692851c3955462fe08881cefd22dd05
font_02_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 17092 bytes
SHA-256: 4b9c78f4fe0a0fdc50ae3d8bbfd45723a7dbe7436fe6ad0fefb5b84775d38ccf

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