Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cf13503e4fe29d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 08:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d80070087b7f4419c6cdf5daa89ca0b SHA-1: fd00d8e038fd8e92b525d63ac6a3eedf5ad4a959 SHA-256: b3cf13503e4fe29deefbcf4eb7ad54720d442e0a6544fcdb91e4f815952b2c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farms indicates an attempt to direct users away from the current document, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=how+to+get+sound+on+a+live+wallpaper+iphone PDF link annotation
    • http://onlinetradeshow.ir/uploads/files/57729739045.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613776ff93b42---zujawonoganubed.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/99933828671.pdfIn PDF document text
    • https://razredna-nastava.net/files/40954661482.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22600252620.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_184804.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/pigipigegujurugen.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161402cf1c2e96---57042452045.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/lujan.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/89247427552.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/dinifimalazik.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/xepuwedasorusuguge.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/70992170339.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/lukuv.pdfIn PDF document text
    • http://techbis.pl/files/file/70263982576.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/petodagovape.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16777005862.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/kabuxozawokafudaz.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/n2p89g5gnk1lp2j9ebsqnqfljb/12021994314.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161371debaf7b5---fupefijenufuragixeleresuj.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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 10912 bytes
SHA-256: ae53cd0b4b10b647e2106276d32a5bb0bf7cd4e298d3c1c61c43f8e09cf82632
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 18040 bytes
SHA-256: 0dcf8279f4fca31879923a9ef6d5148c8fb84e941305dfb363ed6edf58e96528