Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cdaa4b6d332207…

MALICIOUS

PDF

136.3 KB Created: 2021-09-06 10:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a199eb36354e5e340dda147e3ea065f1 SHA-1: 3c37f43a7407c294e969e9896a227629a475aa23 SHA-256: b3cdaa4b6d33220774c3396a5de6c568ec3539c01b6a4142cd5a7096ab7752cd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other domains, likely for phishing or malware delivery. The presence of embedded URLs and the nature of the heuristics suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=passengers+preference+towards+ksrtc+pdf PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f211928dc---38665491451.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/94674716540.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/zugelan.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca0da0bf61---67111437257.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/86503670830.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/woxofinonomerafutarajufig.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160808a98bbc0b---jimumumefit.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/rasewiz.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/23630554037.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/10312025629.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c21addef---28789732888.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608928155f16c---febevimajizinorogegido.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43603b511d---zunanujusexomi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4f977d81b5f5f9d2c691780e43affc9e/44500605690.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6280267a1---vamaza.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gqdbptub9ppil6gp0rn7gv6s64/58387209537.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/67615955321.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2264be1464c4dc28434480b8fe3d31e7/wegabafiboreris.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210622151517.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/84314756530.pdfIn PDF document text
    • http://nfc.soo.jp/file/4324227678.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/lexaxekanetovefapu.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_off0001ae54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE54 10836 bytes
SHA-256: 5f4f6a7b10fa5baa0f73509f44ab58c3137c92e6bcc6c264b47f87474dccc92c
font_01_sfnt_off0001c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF78 20016 bytes
SHA-256: 6c688878618b20a90859bc7c94e76691c3d976ef4b4f171c7a5c3e260704ea80

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