Malicious PDF — malware analysis report

Static analysis result for SHA-256 501845bad22241f5…

MALICIOUS

PDF

89.8 KB Created: 2021-08-11 05:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e77332e3d03e2d1cb830cdac53b538e SHA-1: 617ef7f2ab009661adb76dfb83ac0dcbce5caef2 SHA-256: 501845bad22241f5a84903e1018aef9328cf039f8717b6d34d05c4c3d78ee467
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mesterek.net/tmp/39655228313.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7fe9e83f4c19320ac8caa958e98b57f0/fuvibebajarapiperojena.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86108d4c57---dovosewopijujafon.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/64e51f021071b2b1836392d2a8d24bbd/27127324999.pdf
    • http://suitianhose.com//uploadfile/files/94457917098.pdf
    • http://letresorellebio.it/userfiles/files/faluxejinolo.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/zeritag.pdf
    • http://jaatkinson.com/userimages/54433544468.pdf
    • http://agapetown.net/ckfinder/userfiles/files/nepivut.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/n1bvkm3aubikoq8798ei9ccor1/juzofoxameludewivitekenat.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e2ceef79d53efd6ed9ee42d64446b1a9/jobeduzivuvonebafozipibu.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/heche4m7aj8d027rq8851o33kd/72556760409.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c89df2f16b3---kozepusoxamawefiwagug.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/medipipuginajeju.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7494feca1d---worimubezudivakigowejijo.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/523940698c7d99fb94dd42df56e15a79/21659280954.pdf
    • http://on-video.com/movies/movie_data/file/lutomepi.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37d868d86e---19513608060.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4rm2r5a5gsmtpf4vbrmt0ege60/najemin.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/74378bebb8e4a581a6ecf4ce3ca05611/womadamafipekuvunafuvirot.pdf
    • http://www.niziointerior.pl/upload/file/64111763755.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/jurevidibosafigodorepowi.pdf
    • http://www.yemany.com/yemfiles/files/87799596701.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a3f21f2ad1d358652318b92820aca3d0/83394927354.pdf
    • http://chipgene.com/image/files/20210726_174854.pdf
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/vetarefufalakek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=utorrent+free+movie+download+site
    • 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_off0000fd63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 16792 bytes
font_01_sfnt_off0001157a.bin
2118a2f03d4cc30618b153963baa5610b3be637f05d3f478db4435ff71cd3f92
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 10672 bytes
font_02_sfnt_off00012dfb.bin
f8f42de9c6a361634480825f42f2d245e4a01bbce9f2a78ea4d7e5c09082fcd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 16740 bytes