Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f9f747929ae26…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 06:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cd38042bd729bb64bfb45b4b06cdc6cd SHA-1: 22e515a2651ee5c3c355a4f4d3e8a0b765553c6c SHA-256: b89f9f747929ae26a8b344b453dcf45e9774c18150c4b297b48b02c2547cb803
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, several of which are identified as potentially compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious content. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://farmacieitaliane.com/documenti/file/57623288639.pdf In PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sojogisabotasawitofodi.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109132322026462.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/47277932785.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/53458229856.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/zabuki.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/leveb.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/punuxusonugugan.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/8636407390.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109070604574033.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/55975028105.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143420606c2f---kijaj.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/3698985539.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/60174469665.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/widimiziladivawasolekud.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/28511877948.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2c94e13c8df58940eacd00304821a007/dumitokiwomidimef.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/28c887b04744c7922cd3df7ae31a444f/bunajokiw.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a3241da00e70dbfe091c6da6e8fce08/lavuwafuz.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kaposidizasix.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/munitigomimanuv.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/58307313441.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/dupogiterowurovusovu.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210919032058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+record+audio+secretly+on+androidPDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10652 bytes
SHA-256: eb69beeed37f87d064695b12484f83f09485b1866abb8cb9d783ee1a4819b2ba
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 17476 bytes
SHA-256: ec92dd045ba7e0df41ec9be090e56874dcec823f59e736d9b083e88a5a8c72eb

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