Malicious PDF — malware analysis report

Static analysis result for SHA-256 594e3790248552a7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-24 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14a477fd361eac40ed0f1ec8df30a85a SHA-1: 3ef4fd4c89161a6f60253212c82ae88e9d9f5945 SHA-256: 594e3790248552a74703fb52a63f3ebb92a54ce73793e4d409fd9b02ca34791e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicates an intent to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/32541144e2aa4e5a1dfbccdfd7816046/lilujidujojawipovokug.pdf
    • http://libertyquad72.fr/userfiles/file/82769660511.pdf
    • http://bassbasement.org/userfiles/file/58841119948.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejule.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/4g9dfdnabcmah86pcmcn05bv6q/16483459953.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/8620401695.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ok43chcrtjkuinj64isv3lh6k1/79857267320.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ecf5e593f8e5862ffdc21584dc2ae9c9/gozipipatepazuvunodidebo.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e45705be17eaf46768dbf2825fcb7449/navunelugi.pdf
    • http://ssatripoli.org/userfiles/file/86376670672.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd660bc7b---57645466421.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c60229c5cc2---dofakix.pdf
    • http://safeabortionnepal.com/userfiles/file/90541919133.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/31248088032.pdf
    • https://bataretak.com/img/files/file/remofogazoxa.pdf
    • https://amrapalispot.com/userfiles/file/bikovavaxi.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/61969891287.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/370670063d4255bcfe9f50b1e2402b30/nosexemilugajepevimanije.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a8bce966---welalofitesogoni.pdf
    • https://eternalbliss.net/file/68401187390.pdf
    • https://publicbridge.pl/userfiles/file/zatoduzedizinewedu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb9d412e65---zewaxaxasikum.pdf
    • https://embassyinvietnam.com/webroot/img/files/25256488638.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/28a07ee33218e18834dce7ca5ea2041c/21148722123.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+calculate+voltage+transformer+ratio
    • 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_off0000e8e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16792 bytes
font_01_sfnt_off000100f3.bin
27ef2d6e6bf7de5139ed89f46331088a6854bf529cb4f8edc438496c5c664cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 17976 bytes
font_02_sfnt_off000130d1.bin
166cebc63499dd5eb42c16347ea587d785f8d25d1d42958bdf7b90e5396e095b
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 10920 bytes