Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a123786e949a4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4b4fe8f4e932b438dd0b9bfb3008aa5 SHA-1: e4d05cac1041aaa4968d22033f392ca5440f8510 SHA-256: be1a123786e949a4ac3c719f4f2e3cf4f220c52276b79fc8fe67e21142c76c18
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. Numerous external URLs are embedded, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://ketchas.ru/uplcv?utm_term=battery+saver+android+github PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5ffa1b4b45d497150c38c187efeaa585/33272851621.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/rupanixutakopad.pdfIn PDF document text
    • http://apart1day.ru/file/lutuvigibolo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c8b079f4f---talotawidora.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/zovevojenalugufuzop.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ccec51107---naninorupuwigopixile.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/45206646011.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/i5diia661ol9l4pb9h2eq8qqh5/vepewasivad.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2beadcc703d1778c7117bd646c2686a3/bupodaxu.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/50115524599.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/keritemilan.pdfIn PDF document text
    • https://combrooncom.com/contents/files/kavixe.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eab5f96c3e165296178b4780fab3bb21/lukegepaturekalufej.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/85335804024.pdfIn PDF document text
    • http://koala-al.com/d/files/nilirekatafeludaxeduro.pdfIn PDF document text
    • http://osayit.com/images/file/23793816977.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/faxibubavuwolafe.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210913225008.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/14376440659.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/29944385815.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/8014175797.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/28846333818.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigagewatanowewikeniz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/70885659229.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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 19528 bytes
SHA-256: 41ce4880fbca73ad5b3b40c8c6440e69714ad4c74e535e4dbb22d811f8306f83
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 10956 bytes
SHA-256: 58f0af5709fef5e15d06894f52048064b7b365ab60b6c8fa3c66f726d7dac314

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