Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fee6ba6c40c9f8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25fe47c40f9a7d33089cf7e837337286 SHA-1: 7b830525c2d52ba1b0f632e625f38bb2858b19a4 SHA-256: 43fee6ba6c40c9f8c282df0c350b6bd1705812bcb5b71748b4767ebe5f8d4ea6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, including those hosted on compromised WordPress sites and disposable domains, suggesting a link farm used for phishing or distributing further payloads. The PDF structure and embedded links are consistent with spearphishing campaigns aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=all+sin+cos+tan+rules PDF link annotation
    • http://aitrans.org/UploadFile/file/F1202109091720146474.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/renobumebigodif.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6446c8d7a69a1694d21b410c3e836945/31604120253.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/87815973921.pdfIn PDF document text
    • https://nistd.in/userfiles/file/38818420442.pdfIn PDF document text
    • http://osayit.com/images/file/gazexesonesaxedavudenugov.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/wasejomajudowuluxebox.pdfIn PDF document text
    • http://hidropro.hu/upload/gudikabolixuvo.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/79696382817.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/24864887549.pdfIn PDF document text
    • https://mediaskills.rs/files/jonig.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/tiwigaditukesizefadinoj.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/watubawomifew.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210907215339.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/lapusonavexo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389420ea15f---97681916142.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/44112217858.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613502ff8ba9e---pobelilizadujexi.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/zelomifamivovotata.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/82865345254.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/58592744019.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4a7c1b43---76227234915.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/nazapopijosomokegida.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/92221731449.pdfIn PDF document text
    • http://lejonhund.com/upload/64805429318.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_off0000cef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 18520 bytes
SHA-256: eb7abcd18ac5c1d16cd8b0d80d9c7bc3cfc4b353c09ede7005bdd4b11a606d15
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 10304 bytes
SHA-256: 61b0adddaf58ad0a0adcb92d37122dc480b9e52600b5b3370177790acb5baf39

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