Malicious PDF — malware analysis report

Static analysis result for SHA-256 d505b1240e8b37f4…

MALICIOUS

PDF

103.9 KB Created: 2021-09-21 13:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c69c7e828b91c16090b279d670ab7e8 SHA-1: 7af6c2d5f5009f5cb82b2d422030098985ffa63a SHA-256: d505b1240e8b37f4b9e02e8819cbbc0fc491d8c2d7bf1a48bb49bfe4a432df4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple compromised CMS upload links further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=no+crop+video+app+for+instagram PDF link annotation
    • https://grupa-energia.pl/attachments/file/mijufanevikasonigimenu.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/57367745398.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bdefc696354c7c280d078e303f8189be/4324009372.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da302dbc8a---92504743990.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/kupukaluzumatox.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8c706f03---9256242032.pdfIn PDF document text
    • http://apcmagon.com/userfiles/kukedotizigabisidesarur.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kupopurokuwuke.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/sumawikaderojamupe.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/6910828967.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/41687928513.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/rubegi.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/nilakubasamilafumad.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/66227995721.pdfIn PDF document text
    • http://evola.it/userfiles/files/votugebiliwawafikakumexew.pdfIn PDF document text
    • http://mariancozma.com/_user/file/dobejuridusewewikofu.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613587379f035.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/tegotekobano.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/korudagalifarojedituru.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/navodojamiv.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/24242922540.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/sonanutoxosenafavada.pdfIn PDF document text
    • http://nova-auto.com/upload/serabexe.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_off00012f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F43 19144 bytes
SHA-256: 582858c7c8ebfecd548cedfc0f71ed34572d9c6307f3ad6ad4978569272293b3
font_01_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 10960 bytes
SHA-256: 3026f80fa1e0ef3834130eb9fc8bcb0358be759b76ffc1d8967918f8bf8ac09a
font_02_sfnt_off00017a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1