Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f4318996cdf90c…

MALICIOUS

PDF

107.6 KB Created: 2021-07-19 17:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c6beca1577db5445c9cb98e139fc8ae SHA-1: 4ca3a872c87405cb15c2642a220c92c4653f7ca5 SHA-256: e1f4318996cdf90c178244d046093fc394c754b50e8bc2a82ad655ff938e5817
156 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6h9rhl1eijbbpirpmq4ks90ln6/73756806381.pdf In PDF document text
    • https://ccichn.vn/data/upload/file/wasemunenigimir.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/kesupur.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/98615d73fed5d940f9b300d24fdd8706/39434077576.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/bidituwiwexivirisumow.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e45f2749---malomu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/8079178455.pdfIn PDF document text
    • http://nessium.net/userfiles/file/bonosujekuxuforuzabesar.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/88217576705.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ed788db2d95e7954093487ce4f746fbd/xogaropiwijuxudixivexafo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6697cf2bf---82267346742.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/69344039040.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/12093801597.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba0341e42---zesomogipipinetojiles.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jasiwebilamusuvezuvud.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6d0f2547b81d9c5957b5a8912afa2dc7/12846330358.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e9b2724236416f812e84c2f37e97cf3f/pimejuwusiduzobut.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46b5cf0d98---53729967797.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/puwebizawubu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f2c657653f38c34d1788bd0d34f6a36/77347748382.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/nuwegekupabipa.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/6098379137.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/xosetibowegof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+axial+skeleton+is+made+up+of+the+skull+the+vertebral+column+and+thePDF 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_off00013f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F79 11348 bytes
SHA-256: ef80c864564f78e0b3db9a360acf8b71ad2aa2096b06bd30af0b00f633a8f174
font_01_sfnt_off000159d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D1 17808 bytes
SHA-256: 408a28d563bcb570a7c714d98f6003120be10e683b220b6b89411404bd8259a6
font_02_sfnt_off00018875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1