Malicious PDF — malware analysis report

Static analysis result for SHA-256 115779e87105eb85…

MALICIOUS

PDF

83.6 KB Created: 2021-07-08 10:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e871cc9113c27037cda726a9a0ef58f9 SHA-1: 730765afa053ae9bf9485049dae0c2521a47d822 SHA-256: 115779e87105eb85322a354ab5bd90f5773f09a6f3121731a776678c8a439b7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://theleadershipworks.com/PO2/UPFILE/userfiles/files/6245305185.pdf In PDF document text
    • http://simonide.org/userfiles/file/rokut.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/posuvaraxebosizew.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/82d1e348c3aeb819fbce38f57d3efc6b/foperumoza.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dopurijotusot.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f9b89406d498ab17ffb5a0d9e1f2c65f/vizubaridikuguniwa.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f005670292---mekimakaketut.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/nawomi.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/nilotiturazadunazew.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/59784798714.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wuvisiwijinowowoje.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a105c417e397452cec5d102877bbc1da/ragupawekizipeju.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/52tp825s7i47u0k47kjs09m7r1/35900567321.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/85231711088.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210623203622.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160986bf57010e---gonikatetisusipubaposi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/wotodatedanudivo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/09a8e025f4acafa9bdb538a25d6807aa/60817323406.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f2986c75---fogaki.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f937596aaa55cdc3717366a683fff411/zixoleninipalaj.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0dfd894402a20aff3270fdb0e679b3a5/dobagejunidofapikasafurer.pdfIn PDF document text
    • https://rosycaffe.com/file/jokototawexogewumolo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/380819976d97e71b0213d6abcbd26c09/tubatewulefiji.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a56f70379---67658771782.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/pijimerenudezidinezix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=conic+sections+word+problems+worksheet+with+answersPDF 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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 11128 bytes
SHA-256: d4cd7c238c83a239cc757c99e49d7ac47e6f3cb8e28b93e8b5ed187344a8fc49
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17008 bytes
SHA-256: 08af80b53cd6dc21238b0fdee67e3705e972434b0512a329ba61e51cf9c42032
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1