Malicious PDF — malware analysis report

Static analysis result for SHA-256 8134b71f4d395ae2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 15:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c84bc37e8bd0f2be7dcb355e627b4c91 SHA-1: 84adec7d4f0e178f2b7fd11a9c2622ecae694e30 SHA-256: 8134b71f4d395ae212da308805b0c11cf471dfa15b0cd6c575d29c276db81d64
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious, exhibiting characteristics of a phishing or malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update to achieve its malicious objective. Numerous URLs pointing to potentially compromised websites or disposable hosting were extracted, suggesting a link farm or redirection mechanism to deliver the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://irlanc.ru/uplcv?utm_term=videoder+original+app PDF link annotation
    • http://saigonradio.com/userfiles/file/50489100697.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/rowoposewefitefirulevexi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jakoguzoginowixidanuvopa.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/mujaxepikutopupitabomedi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c84be47a66---59251789704.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/kaxejotavugakuxawebu.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/574561988.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06a8542e6---kixidaxiw.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5f8f4b5456fbb4559ea5a4a0b5d498b8/57280095361.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141b4c0e3254---72655831695.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d38b238a---kogederosa.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/98047137649.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/9760757965.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/wiguk.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/67564791607.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/33529648471.pdfIn PDF document text
    • http://yztools.com/images/upload/File/jotupiziposototolewoko.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98755800511.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/xazelekuzexaxekovejix.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/febeviwuwekerolumanazoru.pdfIn PDF document text
    • https://equimat-cheval.fr/file/rigunovojetinak.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/68dfd906bf3d5849993475df972c7211/kelexugalupos.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/37330382845.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/nifanilavipigapomuk.pdfIn PDF document text
    • https://ratodua.com/contents/files/pogizuxetaxu.pdfIn PDF document text
    • 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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 17220 bytes
SHA-256: 36371e38f848aba7250d12f4db1e1c3731621f1b2d1a27623d090973f2cab502
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 10268 bytes
SHA-256: 8b7e501506b4ba85db8a8964092b38fb4ac207afc715f9f5520f03be7e5079f6

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