Malicious PDF — malware analysis report

Static analysis result for SHA-256 535bfaba3285462d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 08:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fd1b5dff9f749567284265fcd721673 SHA-1: 5396cd532eca5e0f7b1adb131b504d8fb5efa3f0 SHA-256: 535bfaba3285462dded0733b8f96d4443a7718b7c5461dfaec8ad9a0ab2837b1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2f005e047---fasesobori.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18329178---27301837483.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/546ad3153f2e89db81425180b260f1d1/wajuzi.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/34159116138.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610606d068de8---kolitakole.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062011580638.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ac19bb6b4---zukudazuwurozemu.pdfIn PDF document text
    • http://cobmedia.hu/include/nebowogomizewig.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/62212176162.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b69d5c09ad9---22594860891.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/65337486428.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/3717532046.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ca738a0e18d6a1fff0b730eada0a0857/78071097471.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/85025525275.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91198959fd---84489350456.pdfIn PDF document text
    • https://t2sc.me/userfiles/28507725899.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/mazale.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hqmb4m1k4ld3dfuloj558pmcfb/51728426911.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/p7423s6kn4plger1fr08anp0q9/31939294982.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/zebegamaxoxevumefiputevuj.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/gujawopil.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/72806141029.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/kalojozoximapugobegimof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=famous+bookstores+near+mePDF 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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10440 bytes
SHA-256: 0af4944a459649fb574703e824c9ef043334fa0f72bdf74ce1c8d710f568fd55
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 20580 bytes
SHA-256: 427bce2514de6f5be7931d18a20df57c0565323ab145b08d2910f3014a84db6a
font_02_sfnt_off00013976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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