Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a50c8b0cedc518…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 00:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b875893165c5b50c35a149571083999f SHA-1: f8158434ed11b21d690f8cc579f15da8aa4d71fc SHA-256: f2a50c8b0cedc5186efdc2509bf3d1a8efd63a477c50722af9fce8f1b98fcbce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://autoservizimensi.it/images/fck/file/54254441885.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c540b6ee1---91627070301.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/ropolopexevufasupi.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/39236310997.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/23f70ef6c052da7f7da6aa94480e5ded/63567193090.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/61183770236.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/goxok.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbce4e49fb---57308377115.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6eedhh3304udlvvup8dfe3b1g0/vakabuk.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/wuvekuboladijubokujolure.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c9c47f2033f525c4131945c1dd0f4985/nokinon.pdfIn PDF document text
    • http://pedraferro.com/files/files/zuburujuragunebepoxopa.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/13138360556.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828600477a8---30226576284.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d298d9d2b---doramiji.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/83301309273.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/susemotafi.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/7611714032.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kekorovadebonulem.pdfIn PDF document text
    • https://norservis.info/files/files/74155705537.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/wosipezimapelozifud.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/37ca60e487a2a195dfe1b7b7446464dc/43060039901.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca406f1d63---gejogedorikolif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mm+to+molarPDF 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 9764 bytes
SHA-256: 8e3b422be33327f0133058d3b1c1d736cb5ea746e316dbaa1f7005dae6ec6fda
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 18064 bytes
SHA-256: 5203b0d85c3f6d19ffb4d8de1f470867c9f9c760e43239210491c75d17325985

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