Malicious PDF — malware analysis report

Static analysis result for SHA-256 378f5deb5dda0b59…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 05:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20d96c8c580d20cf863c2e96211f71a6 SHA-1: 5e3e7bdcbecbe736cf6cc9c09fa0d5207ecf1eab SHA-256: 378f5deb5dda0b590a93db094ab9456e5c8c245c8800252924d543888f3cbcd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely to obscure the final destination and evade detection. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest it is designed to redirect users to phishing sites or download further malicious content.

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 https://infrive.ru/uplcv?utm_term=contemporary+architecture+buildings PDF link annotation
    • https://alrashed-alsaleh.com/userfiles/files/31778839616.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/47251077602.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/49e8b7ae13ced809a825068f49d3a86c/6898751325.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/zizuxovusugowirenebewipe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8fca562---6444478880.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/gexik.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/laxelubanotubununamu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4648f4e---nowewanebogatuve.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/50440797926.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/ritevelufebaburezevareje.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/84686018849.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b1cd9daf---73542316693.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848b01c0879---nedeja.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/88374059381.pdfIn PDF document text
    • https://isleo.com/i_photos/file/nivegakutikinu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/19559557772.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610017a7bce18---buwewamoge.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a34bb717456959ffe340fed85c5b1ae8/degakizakiropagikiwapu.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/24327742391.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/75946746567.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b011093e122---99638211634.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd1c1aeb08---vakaloxebi.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/bijoponupokub.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40330107406.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03a5b26859bb6d5aa19671c70eecbad2/79193191112.pdfIn PDF document text
    • https://eamenfaraz.com/cache/fck_files/file/91935403883.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_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16972 bytes
SHA-256: 11405c1b952de105fd3a092b384a9d16cde2f918bb8d88cf506a93fde84a5516
font_01_sfnt_off0001172c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172C 11344 bytes
SHA-256: a6018a2cf6f4765d17d6aa8d8e21a500391ff7f5bf539fa43b20ab48380f2063
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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