Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80529ad994e5b7b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 22:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d49b57aaebed0aab1846f3389d9e36ae SHA-1: ef918fa4fe42f998bbff22b819341447c68d001c SHA-256: a80529ad994e5b7b0f1b3323869ed4529a06072a0ee163e3cbc3f4d4a8021e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple domains, some of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=access+work+profile+android', are likely part of a phishing or scam campaign, attempting to trick users into visiting these sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=access+work+profile+android PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/bavad.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/50149826843.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/52844657210.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7399850b3---90896432069.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/xikitawaforufex.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/19935158541.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530ebee196---vagagedirisegitojovas.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/bewox.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaa80b677---sedezupesa.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/06aecf99e77163efbac4c93f5edfd87a/mekojifuruvemigenube.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/86986841894.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/34257803705.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb316f862---36295775160.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/20035482741.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mavegozugaziduzid.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ob0v1bdnvhprlr7b200oda8ke8/xedukizadon.pdfIn PDF document text
    • http://torgoborud.org/images/file/sesuguvetifunul.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/zuwadevadunepexezijoja.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/fixulilizubolifilonam.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/komixep.pdfIn PDF document text
    • http://ssp.by/var/upload/54243116773.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/doderineligaseguwijigop.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fanofo.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_off0000b5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 15064 bytes
SHA-256: 4d77207cce78ee00c348962ae624c9f00fc07da519cd5f9431fe967aeea38b33
font_02_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10672 bytes
SHA-256: 1f655b3ae653129569bfe68ad1bcf996fbaf55327ded81543b6b93d10db564c9

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