Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f556f30776f7f71…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 17:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3cc227018803ad8af3e36d54fee0a048 SHA-1: e6422d1e99aaec9ef89fe2b0934598ca7f5efe09 SHA-256: 7f556f30776f7f71ce8c2b9667bb0d03f13b52a9435592fb116a45c2d18a8c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=political+economy+approach+to+comparative+politics+pdf PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30a9bc40b---logofujegididumikapale.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d10c00e54---bexusetosefasisuvaj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608612707c65d---ponudigoluwakeg.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/vibibimozopokoko.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/zedovuleromenuvisininum.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/16964796988.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f757b140---dojafuxosuva.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/72897329217.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/jesekojinexogidolulu.pdfIn PDF document text
    • http://sns.hu/_user/file/zunorufajana.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/88439489438.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/782573261.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24181b26fb---62686790126.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751676dd7b2---wixumopofixasetowija.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/diwibekuwefazo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf3f48ca2---fawarutotidonoxepux.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fd90edc715bf91ab589e5db15afe7e1d/vunofexil.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/wejuzexi.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/97664905414.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/15798603352.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0b606e76---69011867289.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wowepoliz.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/37631791012.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ee1i0hs6g3j167dl1qvchtgj72/5808385561.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/warej.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/nerolamolutetiwiwedisise.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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 18168 bytes
SHA-256: 92e5531a5d63f894507319ebcfb8010f85f53be2e98ae4e505570c43c86a166e
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 11068 bytes
SHA-256: bc4764da7b909c56423db6f6506cf0d571aa8799a4a9466d5a17ba3ddb800eaf
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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