Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d992b2c263f8bc3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 05:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ace2730d2bf2c691fdde761a1cf109b7 SHA-1: 199fd4c7be6818cef929161652622893ee2295a6 SHA-256: 2d992b2c263f8bc3d62fb6ade84924aeb78bdac3e7c14a76a0b25476bde247d3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://ildongwire.com/userfiles/file/88957114311.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c486f948ffe---72093504424.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/fidotuwimizosel.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lta54fc828q65q212hjt26iteu/84737028333.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/bamunakole.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/dujatej.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e85bfb37bd---fivaladafirisumexik.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/99bc8b035357125e01788aca40fd55e8/61299737209.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/2678962534.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/44636200045.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ffaf0fd6c---fifixewoluwafutazafaf.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/delititewebidakoga.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/be79a228eebed050e16b4f2901259a4a/kifefako.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/dozimujugigovepi.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/50827066654.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/sasitobi.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210628105024_fw5h7w.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jerazefitawivifipe.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/donamufigunifegalef.pdfIn PDF document text
    • https://coevent.ru/upload/files/58852145939.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/16527533765.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e614463f30---wurugirogefoguroba.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/443dd79ca4e4db5aaa9dd8e9bddd6546/48926399625.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31cc483a1---63455143625.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b93851be364c938820b8bb16c6cb5b3b/85363710514.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a65710a7b---23855172034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=who%27s+or+whose+examplePDF 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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 18836 bytes
SHA-256: c24353a204098ad309cca088deb1e681ef24fa0d89cc50eb7ecdcf0f93a1b247
font_01_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 10436 bytes
SHA-256: a850a937a0876a14c8bf7c585b9b318e85d3e89eb43afbabad1e1945951b51f9

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