Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9b2e286e8232c6…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 02:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 939edc32f9b8a9a8c1bda387eb262c67 SHA-1: 944bcf3742efbd024b4e818c08487659137597cc SHA-256: af9b2e286e8232c6948b346b2d4f22338cad775ec260fea2b5ceb502258c0350
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to compromised WordPress sites and other domains. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/waketuxosojamonetivabomi.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/681b4e6737f532c8a3b88f57b1c20905/8403863984.pdfIn PDF document text
    • http://gro-felix.si/uploads/55030555677.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dazode.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4342310378.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613075d6e24bc---vaxesaj.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913070823499131.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132365ca217e---tivugelalixunovufokazifaz.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/50622617981.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/38570134911.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/72229213115.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba731ac1d---50618617092.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/81406782628.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/muxipe.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/2242945365.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161324c9bebebb---gulukisekuvumed.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/38311422813.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jovav.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e9a7fa92---pitazawapemerote.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/muvapadi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/27992945555.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/rojisuba.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/jojasejanezav.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/70430217155.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/xazisawubaxegoliviparaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=app+galeria+fotos+androidPDF 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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 18208 bytes
SHA-256: 833cf806ae48c620f117f380f265bedf1f8e7b2bf24b6fd50fa364439d1dcf68
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10656 bytes
SHA-256: 838c349600772659d584c22340d163cf3df9f075daf6076ed3e92c2145889583
font_02_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1