Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e433e8fe4d8a24…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 21:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7f66a0fda184535f15f7ddbe66a8c87 SHA-1: afa9de3a8b3abfd3309547f02784bd4ba11534d7 SHA-256: 04e433e8fe4d8a242a3c2aa6a26ff470dca3f6246f2a3ae3f5a40a2328c6c6e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further support the malicious nature of this file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://inwebjor.ru/uplcv?utm_term=tea+for+two+and+a+piece+of+cake+pdf+free+download PDF link annotation
    • http://pappteam.hu/userfiles/file/gunagese.pdfIn PDF document text
    • http://blueyee.com/upload/file/030952544139.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/10375953619.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/wumixagewijexu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/199a00080917d177714148edb68deb09/widijuloziras.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/sazuvabobop.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/28522571242.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a757bcc1c23---pamovin.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/botijedojanerolu.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/4934298150.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16126ba1bc6eff---boloremebomoje.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ckvergbuqc9hv5d1jqpfnqm8vj/xilupit.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf28623fd44---farabomiraru.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161064f01e9b69---28195479976.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/veluziwosunefi.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/96002171943.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/87538460280.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e269b19138a79eaa9165bc54813ab1f8/simirefetovogewomatidiso.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/37770440032.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d6942675c01e6fea21430457a15f990d/bopanatenalefusurebaxoko.pdfIn PDF document text
    • https://miet.hu/kepek/34689227756.pdfIn 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_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 10584 bytes
SHA-256: 66bd3618fdd21ba6e775dbef3a698813d053159e4e9fa4ad4b4f78932667cf47
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 18600 bytes
SHA-256: 3f9cb784edb4cb59e5c8b7ab312334c4e6b61cd9439bf56bf09765767bfd0cf5