Malicious PDF — malware analysis report

Static analysis result for SHA-256 13371258e2146eb8…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 22:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d37440d479097815f681c6a2242bcea9 SHA-1: 010a1be4a668028ef01e7e53230af878ae1a4dca SHA-256: 13371258e2146eb81211f990b76503bf794ea16d627774a3fe4ce710e91ea835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://netmutum.com/userfiles/file/38274947616.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a451735302---14349891591.pdf
    • https://facades-et-traditions.com/actualites/file/27591929326.pdf
    • http://nebo52.ru/uploads/files/bodadoxu.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afad4a94aec---fanaruzer.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fa21ffca---bumafoveniderunud.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d501c3345---mejiroriwujadunuxewaf.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4941acff351ffec88493145aa296c489/jofaripopaxavero.pdf
    • http://brmhn.com/userfiles/file/20210714120658_rhxvgj.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080343d02e60---wojoxugaliridarasotani.pdf
    • http://ufnk.fr/app/webroot/files/file/33446537444.pdf
    • http://dunajecbiala.pl/upload/File/13569748997.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/78d1b00c9f849dd53635075fb69d80df/burovumuzadoluz.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210530013754.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce56d6248d---57405502878.pdf
    • http://sobsai.com/ckfinder/userfiles/files/97991081252.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87f8fe4e72df828212295548ec0e7c19/fafarekusefidamaj.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f215c3299---lomuremalofuteluluzu.pdf
    • https://bushregenerators.biz/userfiles/files/winiluzajem.pdf
    • http://georgekoldun.com/var/upload/file/52906662454.pdf
    • http://cestovni-postylka.eu/userfiles/file/37426015462.pdf
    • http://brava-ekb.ru/userfiles/file/64459831080.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e95735603---83656677588.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda3d77f1f---tuzelinig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+distance+time+graph+show
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f578.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
font_01_sfnt_off00010d8a.bin
0bbf55263a052e5a58cc4178e5c392b97004a02abb521d7cfeeaaf930a199e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 17440 bytes
font_02_sfnt_off00013b5d.bin
f6bacd5bc0d8a10b5a1eb3564ba258a0abca4cb89bd4c66c8fa18ad5d7dfd04c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 10996 bytes