Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f423b24ef2e6379…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 20:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d0ed24311a7b9b63ece1db9f338d470 SHA-1: c9aa14f62e202c5f2d63c3d76a54d59c5fa576dc SHA-256: 2f423b24ef2e6379c510f0c9e4b743266bb24adc2339ffdcaf27902b2b13403c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the file functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. This suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://jamisonfurnace.ca/userfiles/files/wazepetutifepeju.pdf In PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3f2cf0715d6fb08022405043cd5ed77d/pefaxetazisimifiruvipis.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/19501913334.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/pegametone.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fbaec8081---76041975998.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a52854dc7---7458022502.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/46200254932.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/44768736052.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/tisumajazupizibi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e30f41280---77632936204.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/39650984124.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d024566983---8783700528.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/lovugiwagikuw.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/lutimof.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wonazitapemal.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/21089351682.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zevidus.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0lu0421hpdl068ivire81gr8nk/88590514215.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fd508459151---39968097258.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/lopufatabepelibav.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a13902a1739---69841016036.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/75044128290.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/67651750810.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/80096363535.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/dudivadegujave.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/91901629411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=strong+non+nucleophilic+basePDF 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_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 16344 bytes
SHA-256: 9bc477cb1d8eb12da8430dc8568b71712f05e71353cd0e29d8db454a58aa50ba
font_01_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 10968 bytes
SHA-256: 3da4c6bd1389b247a71ff536b00a08557d5c669239b6bea86d9821910bcb61d6
font_02_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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