Malicious PDF — malware analysis report

Static analysis result for SHA-256 f437f07b4ab19db0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 19:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d72b866124c0effff92e7b36ff9d6e0 SHA-1: b72533856d7e23a3c0c0190bef2b34545e58684b SHA-256: f437f07b4ab19db0a3e2eb4453ea010278a6d46eb8943550ca309e293d0d342d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=the+fault+in+our+stars+full+movie+download+coolmoviez PDF link annotation
    • https://sproname.com/files/userfiles/files/toxigesekemafarirasevex.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161329a370c16f---13229846584.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/59560167223.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/loxabaxanafeboti.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903133509.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/21218926748.pdfIn PDF document text
    • http://enricobarraco.com/files/36438123147.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f3b614159527df3bfd12b577c647108/fumubaw.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/52232032615.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210907/file/63264569887.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/20443857769.pdfIn PDF document text
    • https://bem-sa.com/img/file/50051082026.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145aed83a1ac---40063761108.pdfIn PDF document text
    • http://denge.aero/upload/files/weluwovamelik.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/36438921429.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434c8d1eb67---jixawawibepotopujev.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/51398168231.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/32415719665.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/70464927127.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gsp7aa7katopv6pmk0lnqnlcs7/wafetukurusuvabonob.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/wuwotarunor.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/dalupokaralutizanafum.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3891e25e---84343390716.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/72731576751.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_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 11016 bytes
SHA-256: f97ffaf184872d2bc2bfa98e3407a55ec36e930058d04a8662e7e44298372b8c
font_01_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16548 bytes
SHA-256: c47e8c5ba5d706c6b9016a4d5156b4a00dd8b4b5073867ea4b955de8ef85559d
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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