Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e37b49a6999ac9…

MALICIOUS

PDF

84.0 KB Created: 2021-07-15 11:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43a8dddace90f17b30f1622132a51830 SHA-1: 427d4819b70ecd28684f55f274f3965e80f9fb61 SHA-256: f3e37b49a6999ac9ae23f735f68b5311df4546cd3842596b35a8b5c8f7dc201c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=jack+terrier+chihuahua PDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0dm0p3c81qoljapre7serp8qg6/3710821368.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/nopasotopokij.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160835f9cdce41---95009054765.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/60819034485.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db0e6f4dafb---nijaguretome.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf523f92a69---banokesefil.pdfIn PDF document text
    • http://tipiland.net/upload/file/bogifumuzakedixa.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wojosidawuzedoxexetuke.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa6e25730---zovinekenog.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e426a899---82595018338.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/730c0748e710fb32c43a2fcd2462e601/61933467589.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/nopovim.pdfIn PDF document text
    • http://yjccnc.com/upload/files/62691575331.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/12bf196ed6b199c83c1558ac5d6bcf42/38145881574.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087202a72fd9---22816561466.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae1e757c5---riminitifawulusefure.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6387598950---goxodowolodomogokuf.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba42b586927---32875679259.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2395b220---zomivi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d6c6622e---12648001387.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6a9d0de90---faxit.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xaxoxeronuvobejosaz.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 10072 bytes
SHA-256: eb27b397a6fc75858f0327d611b75ec3b354c8605593dd35af6aa9987dc17db4
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16780 bytes
SHA-256: c95f4da6758ce0ad5aaa3f1bacba6665f041ce60bc02ddcae12bac9a5eb3da8f

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