Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e6b50dc360c2ab…

MALICIOUS

PDF

106.9 KB Created: 2021-09-08 17:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62b6de21500487bb15ac1777fbdcf4d7 SHA-1: 5b0494bbbe8dbe59f3a5056e17831f10b74b73db SHA-256: 28e6b50dc360c2abd2a609e1f65ef1b4194f09bf9b13b817a64e09732d2ce079
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://qigoodteam.com/uploads/files/202109060414242574.pdf In PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/2428264560.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382ca69d70e---39414241668.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8d5adce3---reroxupavafuxudiwasu.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/34761345029.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/82242061489.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/47667205396.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/zovusegajademaxewopo.pdfIn PDF document text
    • https://polandpools.com/contents/files/gawezidovalebux.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/19087445032.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/jepivaxijebiroso.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/57569064204.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/99167399936.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/dubejariz.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/1582607958.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/rokizewafafazoga.pdfIn PDF document text
    • https://posh.hr/files/bonukuxokadudakaxi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131587685709---xarukatuzatosogofag.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/fowefovozufifuwukiju.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/58007816717.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/bafadorivatinomomifolelel.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/faxaz.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zuluvubevenegonirox.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vijopivopedonogufetubizex.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/nakujame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=critical+path+method+examples+pdfPDF 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_off00013b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 10916 bytes
SHA-256: 246bc123891ce7a53f74ba7e02969a2400bd82b1a39ec6ca2e0c3375cbe0bdda
font_01_sfnt_off000154b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC2 18660 bytes
SHA-256: 2c8ac35f3cb7ff95045358f7584d695a798693a2a9b5f3b6899e22943f14ea6c