Malicious PDF — malware analysis report

Static analysis result for SHA-256 759d2d337f44054f…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 07:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ffb5310e2c73df15b00bad9c66a53e9 SHA-1: bf975b5db9dd8f7e07b98f5893cf5bf4c8f3a100 SHA-256: 759d2d337f44054ff26a482bcc0f4ca90f616494c1de39e2827d5eec5af576dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It impersonates a document signing service, a common lure for phishing attacks. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links and the impersonation lure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://smidgel.ru/uplcv?utm_term=pdf+how+to+add+signature PDF link annotation
    • https://aymfly.com/aym_image/files/fawexunudegojutezuletuf.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/da8e15c9670ded1b1ffe0931c12e7e44/13003928306.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1155f5ee8c---90628290380.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/vinasumifewowojubuzemesew.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/blo3k6pft5pr2shv515nlp640n/nebedapanamosudarubobusat.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/89119173473.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bac8763f7cb---jajexekolenewunejizonot.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/25192108448.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a566c9537d---zamagitamosebewa.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/70751597210.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea3e3e827001067ac5845ad7e06292b3/mibuminujukalinerare.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/faxujajapu.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/90381087419.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/81288600027.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/87472976442.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/h7c0m22c6kjker85a0bcfcaik6/32614599476.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/13877989548.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69cca2362c---15663838408.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/kasinitaw.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f47a2ba3---jemorowosufugulozusabaxo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/99113547740.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iv8t9foqnq7blfq5eiscvo4646/18827900199.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787fa1bd207---vugomuweviz.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4dc49fcb23b3d4fde46e9ead36c710a8/jadepudigoxa.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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10772 bytes
SHA-256: f163841fe35e2083c3886c7f9855ea312ae3b01e4cbd47e9e0dec3b56172da7b
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 17704 bytes
SHA-256: 947233cec623e88e7115412fa07a14c18d86663c3c49805cc506fac7dd3ac5c1

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