Malicious PDF — malware analysis report

Static analysis result for SHA-256 c185b5d23569b22c…

MALICIOUS

PDF

90.8 KB Created: 2021-07-21 03:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1b5656000b35676b90f5e85c33aebaa SHA-1: 5d48acb90791049029db0f0107907ab8635de42e SHA-256: c185b5d23569b22ccc151f3725b5d305938d832292733415092f11eb05756100
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://amdind.com/userfiles/file/bixatigukarininojibegap.pdf In PDF document text
    • https://palet-school.com/files/files/tulizogimeposotawomutasot.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad867759e9---lodolidaduvo.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/37033138633.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/5489103530.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074213b8a670---tozufotinepepex.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6acf49e---66617504750.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/99257209106.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/95209947783.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/88826502204.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ffs4v1q6mdooeipq9cs9vv9bh3/vunujovuseliniborum.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/tomepilijafo.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/jiwes.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/22181320788.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/42448986347.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3c395f39---jegabogodovubaratanoxebit.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/6323311011.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/92268791025.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/49detqutpo4qj2tb6bj5vnaqev/guvidijetuw.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76ebb824f---72486978295.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/jopipojo.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/suxuzewituxit.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/genifuvawujot.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/8558144687.pdfIn PDF document text
    • http://446888.top/userfiles/file/98812288608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=letter+of+instruction+for+willPDF 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_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 16904 bytes
SHA-256: 9618ce2bcb71a17a5316413d91cb14fd992ae8f03c5fdba7b45311700af91f16
font_02_sfnt_off00014689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14689 10308 bytes
SHA-256: 0becd6040d60ad3019311604fa0cfa536d278bf0b3acd0ba18996660856f7928