Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2654832f6b0b563…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 09:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cacdacf0b4fe0aa072afa594fd2ca89a SHA-1: 5c7d847f7a655832762f4c1e90c16326818aac23 SHA-256: a2654832f6b0b563b97f6a2f3d1f76165c4cc4ddcf401c23a76ebadbcd2a5bc7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.anapharmata.hu/ckfinder/core/connector/php/files/34065498965.pdf In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/60828659456.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • http://contua.org/userfiles/file/85212473732.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e8fe5b6edf3983df2f800d06281b1070/38790428025.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/dokalarav.pdfIn PDF document text
    • http://techbis.pl/files/file/lagulanubi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d6cfed155b47d574296e850744869910/72859453681.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/39644052039.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80685855178.pdfIn PDF document text
    • http://szjg.hu/images/file/gupupi.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/27834744222.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/813f92269d5138b4a755f0e858fbe265.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/42531546764.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/rivirokukoje.pdfIn PDF document text
    • http://hiniceshine.com/upload/65151511786.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613478dc62b13---sopen.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/lugeputeda.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/74739727025.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/dobaminarajofuro.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/panunamolaweme.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/meveworobafanotivasixidul.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3372b9c9ae08fe4881fe4487a8d45fc9/bejawebatolupolosufudo.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/tunilamavolatakagulopeg.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1ac4bbc6---27988785786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=v+movie+onlinePDF 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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 17188 bytes
SHA-256: bdbdb40a2d6665e78f0197e2812040b8f2bacf425acfbde1170d2519b932385e
font_02_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 9776 bytes
SHA-256: 90445bac44aa4ef5117687461798fc921c9e469eb5cfee0532c41dd47ea60e94

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