Malicious PDF — malware analysis report

Static analysis result for SHA-256 9913c836b4495c7c…

MALICIOUS

PDF

78.8 KB Created: 2021-07-24 04:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb041fc00ef23e698d60faad8bfeba0f SHA-1: ff130610a208036d6427f18133f4a0d559622f92 SHA-256: 9913c836b4495c7c8d0a4f85e111c0a28eaa77cf1d8c718b2c35550715f0a296
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://spheresignal.com/app/webroot/userfiles/files/vevulobazunuwujusanateke.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/207e5dad96f32ce0e98aaabed0177edb/nowoberemegok.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/bonegibopigonepegakesi.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/waneladajowosevagefun.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/47440546716.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/lutodeb.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b9a0abbe3d1c9df0e197f0a17cc57a7e/vaxidalezad.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/90933899812.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/64410760923.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ub8dpji3ni7ul6cculj5jpovc1/duvage.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/833613f5509dfc66577381c21da6d0b0/zadapojewababejuzixigu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/76197dthus9ohogolhacneh646/kulojokixonikapuluwupe.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/16004913044.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719a9291e4c---jufiwidazibirowu.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1cd987f656c3a8f217986ca56baa2617/92330226486.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/denosajuxutogobapa.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/nesojezebadira.pdfIn PDF document text
    • http://shosholoza.de/file/betukojamoporafefaruj.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/kerakolemolamujesuben.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/90985186909.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f41651dc8fe9cc2e6a461e1798af66b5/67461444583.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e300775f12---20430571148.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/221e2e7fce381d6a0705650174a55d3e/51539717335.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/01aa6aee19abd6536c8303d200422e9d/fudozanomadoxevopusolexij.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/36858720459.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/36462345427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=k%C3%BCrt%C3%A7e+mevl%C3%BCt+mp3+indirPDF link annotation
    • 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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 17916 bytes
SHA-256: 57c41dfd0a60f3463ce935089ab2ad30f00f758cdf25149b4516a67844fe6def
font_02_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 10724 bytes
SHA-256: 1cb61bc653dd8990967fa6ad2c3ca378e1d3357c03629c92812fc684b314f787