Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51d49485336eaa2…

MALICIOUS

PDF

91.0 KB Created: 2021-07-22 04:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a7167334a094fe6aaaa7ce451a61b22 SHA-1: 4bbac3996c363c834a349de0f9a54afa868284f6 SHA-256: b51d49485336eaa260b288db6cbdd80dbd3b653b7c36bff439dac25e8d5cb98f
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The heuristic 'SE_QR_LURE' also indicates a potential QR code redirection, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wiruxovujiwetaxaroz.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2vrd3j0360ta2p8fco05362n0t/32037014241.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/42540247284.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/deperadowematupe.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/92ganqog73p8ba1ts8ho48ph5b/65056772182.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b54109fe4---74743961230.pdfIn PDF document text
    • http://zimmerei-possert.at/gajuliwovopodirawe.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/29633221440.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/36574165459.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e247ca9e8---pukopunufim.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8ab5f9cdb9e07e8cf0a97a8b761f6d60/mapagimak.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c413841fa29---vaguw.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa3ba633f---900917932.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1n6t3c09s9moo0598f4j4me9p7/gesovaxegitusasobajo.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e602bee68f9---6132029742.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zodesulexowam.pdfIn PDF document text
    • http://drtamerturan.com/file/nogojovogavonazenaki.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/60406826205.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf0bf521f6---dorukobebukekotajam.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/35925478738.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/7600470507.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/94801754121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=safety+first+alpha+elite+65+instruction+manualPDF 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_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 17668 bytes
SHA-256: 210fa6c9c37a2ad4d2149eda4a1ff389f44bbeca702c6162a80f5be1a5c27821
font_01_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 11336 bytes
SHA-256: e10ed5109faccbf95bc6be076e4734bc115934cff2d030683b455175c5906c3f
font_02_sfnt_off0001454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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