Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc6f505bbb7751d…

MALICIOUS

PDF

107.3 KB Created: 2021-07-20 05:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0aad9554bc23b6d589babcb73f45ff21 SHA-1: 9bc366bd903886df65a68d539354a79d4548f2a3 SHA-256: efc6f505bbb7751d16a23b874852e7a813cf52bd53f39c28962314b91ff7c242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bociany.sk/media/file/25752576426.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec28b2d0a1---damukirijawelimi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1091d98d---pupuxagonanubesisifan.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/59761700592.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/90e140e4243e6af09e5d36deb2636b7c/dabovudikiwagufukodujag.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/82541f8420d380bc066d9e92509139b1/jatorelavenagigaf.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fq9i6j159sgls77jarad4fah80/31042523742.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c319d698ff35710736baaba8a2881156/sugop.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3962fd030a3659d4b6ffda37dc11a0d8/gasuradapenir.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/57138402445.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/92570913400.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0eaa7674---pugilibijesazon.pdfIn PDF document text
    • http://mamam.by/upload/File/file/pewufogozo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/498187b03ad12f514dcec05d6305b334/55345683435.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/55995682296.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834b22725b4---wazulosi.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/koxoponovivimuguzobotipo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eb678af8a6432bb4f058cfb088488282/5310482046.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/dukofevimolalagisugizek.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b990b0262e3---zimekubizijafurekomiw.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a61f9ce6175990d8e71f3954e475e472/zuximuzoso.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/47529033219.pdfIn PDF document text
    • http://akssert.com/userfiles/files/somitekefozirameje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=denis+thatcher+youngPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/rixotodar.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_off00013fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000157c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C2 10680 bytes
SHA-256: a610c459f5a264d37af60558d1a783f6211e5d81986de16b212d9ec41d1c5941
font_02_sfnt_off00017049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17049 18532 bytes
SHA-256: b7cfaaea45a80f7b4a1c76c5787e3f6584138f06b8adcdfd0621f1799b8cab06

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