Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82cda014821fff9…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 13:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ac76af6748b6e4f7788a6b175a3a29 SHA-1: 30c61ebe09a97fc6c054aaf05119f89da336e644 SHA-256: c82cda014821fff962b36d7d9cfa927efe09a84b3d7b16c8aad3d7f68f52dabd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to compromised WordPress upload directories and disposable domains, suggesting it is used to redirect users to malicious sites. The presence of these links indicates a likely phishing or malware distribution attempt.

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://crysiq.ru/uplcv?utm_term=shared+happiness+is+double+happiness
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e3c0b852d50aefc0236c5571c86fa633/822750814.pdf
    • http://ghalemdi.com/userfiles/file/45600690511.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/694536119078979b47d294a85e3ef928/9336824537.pdf
    • http://petukmahaaaraj.com/userfiles/file/71169602022.pdf
    • https://verandapattaya.com/userfiles/files/lonup.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d804cdcf0bd---pividogedizimabava.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094856ad89b1---76420136537.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/lotovajajoda.pdf
    • http://www.ecvbrass.ch/user/web/file/kipadidorekaz.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/75502e7db8cce4b61a3992b082b591d4/lunuvotelemivin.pdf
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/33029115574.pdf
    • http://bawaconstructions.com/editorData/file/sekibikikotu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b9fe1599---xuwaludibu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502231951496231.pdf
    • http://elisa5888.com/shopadmin/upload/files/34557783339.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39181691967.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee615802e---xiposisatuvotisamuzewajas.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ecqh41c2t2590cqa573hid7m69/93903198936.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bdfd64f5---2709890506.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c72a0f5bc---lalufupaxe.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608697b11b30a---ligukos.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fbdec709f---66296993092.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7fihfso64hipdeo7lusqq0f96j/fikojego.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_off0000e24f.bin
22cb8eac8f480be7bd163d83bfd9f35cec275a84de1a54a5a43fa4ad774e3ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 17048 bytes
font_01_sfnt_off00010e64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 16792 bytes
font_02_sfnt_off0001267b.bin
339754abd6826a3028b4c714fbdd703b20bac01d0b6e29b65ceb6dd3927ad557
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 10708 bytes