Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd3a8643cf1d659…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 11:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17bd5cc2ec5d7e91425991aefb365f52 SHA-1: f879f691888be1d032d4d6e88b5c7839d4ec72ee SHA-256: bfd3a8643cf1d65986ba6ec3d7e5dbf18fa2de1bb3963a1615efa1c23f9f50cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://queure.ru/uplcv?utm_term=best+alternative+of+vidmate PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/murimilafomopujinidume.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/mevinitikijejuwal.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/47854075979.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/83721621513.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1853fb3935f673381e7b96625a40b445/93556540653.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/64647095552.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8c53ba22fb1b13dacdcd5d086dca9155/sevizakudajuj.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/56805183625.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109231907111923.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7a9bd214478733bd1480785eacd4f475/bazozugubamizokinug.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/wewivituvuxedaniredodol.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_161942.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902072818950786.pdfIn PDF document text
    • http://dothi.info/images/files/zuxasukuporijamun.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/29605951337.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bafasesajilix.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/tiwesalawibaratogulugo.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/zoliguzutekexilusozoru.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/sufepoxotin.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/piniwiderunezezujavibad.pdfIn PDF document text
    • http://edallyshop.com/upload/files/pudegabutozuwiboxulowek.pdfIn PDF document text
    • http://boki.hu/editor_up/wosigepowupanigawaj.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/78851515403.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/mufazenexogubefi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/656deccd01d7c19807e4d54f1aaf6fbc/wineg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b6494608c517720b4137fba80fbcdeaa/ximumesatewenukolatabi.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/77748044320.pdfIn PDF document text
    • https://777mto.org/contents/files/nogigamotukarud.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_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 10636 bytes
SHA-256: 3fef66299e09636617a10fd1b80d3a6afb012cca0432fa3e8a8a6cb2b11dd701
font_02_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 15516 bytes
SHA-256: 293ef310c7ca61ddef0e36ea08589c15caee5a8211c64c06dc4da4661f3f26b5

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