Malicious PDF — malware analysis report

Static analysis result for SHA-256 61509e0368da34e6…

MALICIOUS

PDF

83.7 KB Created: 2021-08-03 04:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5478901416458962cf247073f3fdf7ea SHA-1: 8894c8097376a6dae5f5fe1f026eb6882d98255c SHA-256: 61509e0368da34e625a719e17b90b27789c5d65557dcb07796c502ef45dbebfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=play+double+9+dominoes+online PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3201b364---kuromatavaj.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/66086285479.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/tabojosolejuguwidirogo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/21681729481.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/92571067543.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f539397647---genokedogot.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nixaguwujopi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083406e346b1---28438936968.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/24bd62e6ca6685115a1cbb0f5c8e8f97/39215104894.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/jubitigimenurar.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/wukanojuxuver.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/najebenuxobavojitozafawim.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/20188162778.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/fehcnhunuqhsmvfl8qhntjk767/12761389238.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/jijewuwebo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d5gv6878s3f2fd1kn7sm5jmcef/14924796819.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160962cf8d8ad7---82998585774.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nm60kkii5imi4jg66tjijtqell/jomulexabi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/33b36a3a486a99878ca3a0cf780366d8/wovulitumemegajejebilas.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/24347032778.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6hkuqmlsp67th6buqkh9ha7skd/2906989882.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844dfaa3d8e---bubugomilipoguviruxap.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918bb41357---lepuzevosav.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0affb4d643---zavavudosekumijopi.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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 16384 bytes
SHA-256: 19277d184b24c90ccf9e4f553010065cfab3988ffba2bee9ea2d050bee3002f9
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 10736 bytes
SHA-256: ac3c6e34a53c6da4d17fb93c361666872fef0051202dab97798d1c80b45274c6