Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbd733adfda1dad…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 00:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4a1f8388689e04606852895274bbb0c SHA-1: 50937d140257cbc627ea8594a2c194f2f3b6e906 SHA-256: 3dbd733adfda1dadfa75cf5d11ca98480aca31a644d82abb3249e0de8e4f146e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=the+boys+comic+read+online
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281f376469---7869103658.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j0j5nvjkq3ri2grsn93k3d0s90/59808649107.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09a9111dd---3280538761.pdf
    • http://bidwoodmachine.com/d/files/vaferelofizitagoladaj.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ndhia0i0up5m6m0tr1a2n3vl48/68999182852.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/nimukaxurimisofabinudeto.pdf
    • http://laduses.nl/image/file/44520315266.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f6f966fa0d83b3ba6589baddde444aa5/40964222454.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b4u47sucf2tfgbnm82gk34uo3o/wepatizefowidererawapisu.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/065ad8b0e51b673b239458be21bec66f/59496580765.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f026e1de5c95e2672731ba22fde0a296/vikakofo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8528558f47---kixax.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3e37e15083f5469ec806a8c51256ab3/20018130277.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60C2B91626C78.pdf
    • http://contrast.no/ckfinder/userfiles/files/59823540456.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad8d826375ee0161bd909292a383c280/vumimuxepajotivulax.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd985164ae---budifanesosigaxalej.pdf
    • http://interface-referencement.com/userfiles/file/gozizawix.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlit8mpj9mnejt4ph7bppin7c7/jekilujununorete.pdf
    • http://carshopm.com/js/upload/files/valuso.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/13046941902.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/09dd1c3e761455ac40d88589361e5ec6/50094821580.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ff48d57764554bb5753b62e305402098/89591402831.pdf
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/18783514096.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/3150102847.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_off0000e28e.bin
40bdcf469e7afaf101ae5ef83a89e7d3378556ddb69735e9281a280c8bbf48b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 17308 bytes
font_01_sfnt_off00010fb9.bin
33dd2d606336f2a5d654ceaf7444736597e3b98fce339147946d15762c2ff137
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 10752 bytes
font_02_sfnt_off0001283d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16792 bytes