Malicious PDF — malware analysis report

Static analysis result for SHA-256 71aa0e204a0f8855…

MALICIOUS

PDF

83.5 KB Created: 2021-08-07 01:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91a46384b0fb59184d48d5c0fb75b575 SHA-1: e70b4ded5c2fba9e29e5713b2970461a169bbf8b SHA-256: 71aa0e204a0f88559bae7207c997cc522b6f924fcc6e4de3ba2b7bc301e4b38d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF likely serving as a lure to these external sites. The presence of multiple links to compromised CMS uploads suggests a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf704c58ebb3d129555f74a3e89bc9a5/jademijopowegukiku.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e366e7614---vuxijegep.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/df7f7321ef2c8aab86597f62fcb1ac10/mapijeragokosuterino.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/degigutuwekunosezup.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e25d9798---23165767168.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4kkk29enojrtup2fo53o3o3u0/75424859631.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4c9708a6---xexawuze.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/togititaragadagamazawi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4a06ls4f255d24h7t3va8t85n1/soxenowoju.pdfIn PDF document text
    • https://e-room.co/userfiles/file/98688154435.pdfIn PDF document text
    • http://lactopad.com/uploads/files/51364274751.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/rimufigemat.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u76n4tcrfmajus4td5fvrpuj90/jarifutimirefetanatofubak.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607168c7bed2d---jozulomamutibewatofepened.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/fumajalozupukusab.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168ae7537e---97673391350.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zotuzutexu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/ronufoxurazofi.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tapafigudipesuno.pdfIn PDF document text
    • http://fittbike.hu/files/file/70669490964.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/36483727216.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/pemuxojodarixovawilikiwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chest+x+ray+report+templatePDF 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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 16304 bytes
SHA-256: eb2ed69a76ef25fba4f719a03a49b282bab23e188da0cdf48da1ff57cef35ee8
font_01_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10568 bytes
SHA-256: 70e863ef5c1b7ba3284f2de766882a4017e827af943244bf05cd55b9730fc3eb
font_02_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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