Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a64ef43cc321bfe…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 15:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a9bacc136d95eb2351cd9c2b63c676c SHA-1: fec107bed2e8693511618e86b49deb22d275b136 SHA-256: 6a64ef43cc321bfec47745ba381f16b2ea89ee46fd53562ad0a35450f5c38d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, particularly those hosted on compromised CMS platforms, are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/12fe17736867e35c7323cc6b4a063226/wodipazina.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161059a983cada---zavufomatedal.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161198189ab404---bulase.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/lifipuxukawubajotelinoz.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f587844a---pagisosijobexulowazuf.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5294cb1838b4f3db7589c7e6f865aea4/73629893731.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a4d37c7f---fajomifep.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/91382208813.pdfIn PDF document text
    • http://penetrat.ru/files/files/lanifipijuwudewoneso.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/58365800071.pdfIn PDF document text
    • http://tid.vn/upload/files/71179318024.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/64848738835.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20463045d5---xasabenipaz.pdfIn PDF document text
    • https://ckmandarin.com/uploads/95696620091.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tetinijuxusamijebisi.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/86226583898.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/gakenukumekujetomajumo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca610d869---besobuwipugobikujasijoven.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/tumirefadirefakiti.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/wijubusagojuwiwi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e494998e31f---81786613323.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/95bf353fe74d2bb6bada785ff555c020/27622404985.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210526032727.pdfIn PDF document text
    • https://termoformat.md/img/files/91511626340.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pirikunediwefogot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pi+love+pdf+to+wordPDF 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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 10212 bytes
SHA-256: 35b7e447509233b31785f484948a68e6ccf0986df7ed7b399d1574a810dc58d8
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 18632 bytes
SHA-256: cf9ea33ea2f737a78f2d9a11bab930efa945ab242f585eac2ebc17029f83e461
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1