Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42b71067c08f1b6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 22:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 561cc6239252c36b9bf38704ec443ac2 SHA-1: 8b47dca53d8fb11a5ef4f1a766d2a4c96f4cc7ae SHA-256: d42b71067c08f1b6c264245db0ee6b696957180d2c532b06f24a54c8d794e45d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests potential for further malicious activity such as exploiting vulnerabilities or initiating downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://hospvetcentral.pt/site/upload/file/66242396320.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3k8jtvrtpq0uo3b9m3ebp9raj4/bivezomedafi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210728060336_2015976333.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b971c2b3fe3---25304902390.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/tafifufemezim.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6d98e681---manif.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49649989813.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/92935192432.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/bevilibisovekujosot.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/41200582743.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021082514272762.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/85085821416.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8fb6c9f7fed4152abc46e0782a06351f/25175017636.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/41197447445.pdfIn PDF document text
    • https://raljob.com/userfiles/file/nesisatewagi.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/xebov.pdfIn PDF document text
    • http://schubert-hh.de/image/file/49086631734.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/44193572470.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fcccaff01---20886726955.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/vikaz.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vutifumowadile.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161012652a27da---gufafavuxabu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87c3ed5b657de17a6ee33f99181f218a/jawajewikode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=estudo+sobre+comportamento+humano+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21D 19680 bytes
SHA-256: c0a64db10992b22f11e47c8ed245a331aeef612f72293ff201b18d44ee1f3658
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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