Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed431ada1e9eb1a…

MALICIOUS

PDF

82.2 KB Created: 2021-07-04 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 597f9e51486bca5da5614d30569aa74c SHA-1: 0746d09b72db0c277e632cc573fed4e4762e95d2 SHA-256: 5ed431ada1e9eb1ab08c1438b9a79375e84dee8440eef7de45a4c8f3f00bbdf4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely used to lure victims to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=journal+herpes+zoster+pdf PDF link annotation
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9404ee122---13477253131.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/wipimorekaviluj.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/rokivovuletas.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/67817964788.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/juarf8br1hmkmk030degvou0no/borelitemoxanes.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad2e6e14e---vuvijis.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c840da3a14---walezuzebajamezib.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d3c8ad39632965f8b9dbc3b9e5db08b/vazexasofaxowojasox.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca48793cf---nixalulib.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d70568eff236f1a08164ed4981b179b9/60636873323.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/nadewilaxexev.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428121121162.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a158813a96---41051053639.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/890d78b3a64f62caa1dcddf0256caf7d/37633786889.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c570bf11e3---96486367238.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a411788ae---wesuxudolerejakomawema.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ff19a86f---10155831812.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210620_39C27D2FAB2A1870.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b198df8f6bc---1076576.pdfIn PDF document text
    • https://hgb.se/filer/file/jusizukujujosis.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a505c07ba96---51347099182.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/xesisipatafizovofelip.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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10652 bytes
SHA-256: 116361a7c853c3625bdb93deb4c8b41aaaab055c79d83fde6e38568e55ce91c3
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16908 bytes
SHA-256: ce5c5439200cf86cd774475a83012753fceaf039e20fd162223f45767975dd48

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