Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6a57d882103c6e…

MALICIOUS

PDF

80.3 KB Created: 2021-07-01 01:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 019b839b14dfa25fd1da4a6445da930e SHA-1: 2f7057ccdc736065992e720a5f3b9bc9a4a7a553 SHA-256: fe6a57d882103c6e6b0da9a81355250573fe3257089cacbfd725c9c7b9cbc82c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of multiple compromised CMS upload links and disposable hosting points to a coordinated effort to host malicious content. The primary attack pattern involves tricking users into visiting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=hepatoma+in+dogs
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160939ee54d52e---97181794647.pdf
    • http://kovacsoltvaskerites.hu/images/file/49573325034.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fcc709e26---kunexupoji.pdf
    • http://zonazero.es/userfiles/file/83203002916.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a4da5798341b526af5ae494880ecf869/31371798219.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/83e27f69f0b80fb632461c95379a5780/defekofepozifozabupo.pdf
    • https://infrastone.com/userfiles/files/goboka.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/jisudi.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/wetijatavopiwepixul.pdf
    • http://belgium-ex.com/images/blog//file/ranofepodurigataro.pdf
    • http://naphogacomposite.com/upload/files/9723417553.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bebc96d1fd512ca8d1691358a59542a8/86370395986.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2d8c5279---nezipujenugegesapewepi.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c3914c84235d66695997633cf0f09b20/84786191935.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b076f56d614de2e839c6d0fa3f165267/xosopapukuwodofi.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad973b7324e---rogatevafeborovo.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/trp17ftnkpuk2vkhd8p7bnft34/tixewafomo.pdf
    • https://jetaime-shop.com/files/64058308439.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5b33dd94ef3e78dc70462c681f6cfd72/tamopojurupa.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/7f847361c34a6d85ee3c8e74f688bd15/57424576800.pdf
    • http://toptoptraining.ru/img/upload/file/48205474808.pdf
    • http://eortak.com/img/fck_temp/file/99403991097.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d0.bin
4d211c9ca1ea14bc98059650211ef1b1e53bf82aa5d80923ceb05adc36152196
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 17148 bytes
font_01_sfnt_off000104a5.bin
fd2f2890b2c6d2f3a9ab904fc5df80a6e25f01c6ddb83f64212d4e15c5661d74
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10580 bytes
font_02_sfnt_off00011c82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 16792 bytes