Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1be529e637e193…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 08:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36118ecb95c6c5e394fd4165cf42bfb4 SHA-1: 05768876a551b93bcc3329bf1d94f13b99541f57 SHA-256: 1b1be529e637e1935865d5decb375953068d9b8dd25e4162d508eb660ecc19a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, many of which appear to be part of a link farm hosted on disposable domains or compromised WordPress uploads. The critical 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common technique to bypass initial security measures and execute malicious commands, likely to download a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://smidgel.ru/uplcv?utm_term=kms+activator+windows+8+pro+build+9200 PDF link annotation
    • http://agarimo.com/archivos/archivos/87224001582.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/rixukomosazinisuzuvaga.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/5237249364.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/12504991031.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fitawuvurefevesed.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/73693244627.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/82359246042.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/11264630045.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jalasunevun.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/56934565748.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6i8o81kvlpei8ta4s4rj9p0vq0/rexujumujenoso.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/75123457453.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161345e20683c4---dunizakunigixuguzote.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210912151310_fh8ajm.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/godemudezapimigiroge.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/39012880463.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109031650375850.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137551f79646---6450787231.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/80845338440.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/67587538467.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cba537a4---71004673539.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fetokugexome.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7gfc84kl3c69d0hfhvt2uabb92/logikoguvuvagekarowadud.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_off0000bd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 16220 bytes
SHA-256: f08b192088fe08f54a5d4cc96140042fd4192ddb769fa346c1c57e2cc4de76bf
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 11544 bytes
SHA-256: d3510ee6007a524d056bc6b2625a3ca29983207574f4ed2390dd66992cbe50e2

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