Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0939a70403da0b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 11:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ef54a9c45bae008caee651599d48c9a SHA-1: 6bcf12fdaf6dfffba950d612dcf8cd2f705815d2 SHA-256: 5f0939a70403da0b424f1f48a77486abd170497bd69f8b35797b23534a8670db
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, instructing the user to engage with remote support tools. It contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://garglob.ru/uplcv?utm_term=is+a+phone+a+pc PDF link annotation
    • http://studiostocchi.eu/userfiles/files/movawog.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gadafodawad.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6f953a9a246393d99edcb0fb7d21470f/jasusedatitubiwivufekow.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2965c2124160231a702a57240aa7e900/86206638581.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/zakuwo.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/43108944407.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b29dc527e---kudogomalidupagukaze.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210904012814.pdfIn PDF document text
    • http://a899.net/userfiles/file/48605976349.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb62c429b---detin.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/dokepalotifibisitirapid.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/21736031911.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/vipewegadikokixo.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021916245281019.pdfIn PDF document text
    • http://hingliltd.com/userfiles/lilaxepogigexiko.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/91149377804.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34230871136.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/vidumaxexonemujulimilib.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/ditatilokaret.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48292995888.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/46895583849.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/xizojuvewiwurolaxoj.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2533e695ce68c40026061bed6a77c112/62077813265.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/wubarozazuvizu.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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 17472 bytes
SHA-256: dd4bd9005adea3ec3aa963788ae7b218bc4fac4399452cc61041575d4939dafa
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10084 bytes
SHA-256: 3d015c39ea47ddfbe9124f57812bc28800640d6e9728e6c22688227f11fe5767
font_02_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1