Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ea86293e9840d2…

MALICIOUS

PDF

93.6 KB Created: 2021-07-08 07:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8cbc531856239d9221f56ed5541038c SHA-1: 7c72ac069c8e19e931a372809abd09be2661094b SHA-256: 41ea86293e9840d2531444ccc56558f4e5182710a866302c6be1c7a3a790cdc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or are hosted on disposable domains. The embedded JavaScript is likely used to facilitate the redirection to these malicious links, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://armanetti.com/images/kotuzugixizeru.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ec27e563---55732642313.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fejukunafovavovovilaxeb.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/2732399832.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/85f7f2ff965613494bdcb0c6eb57b597/64299402429.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3168d6d2---bubadujozufekateniset.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3797126150---78986608787.pdfIn PDF document text
    • http://slsnn.ru/content/file/39792327319.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/96086704017.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uu9fnsfd65ovkoivc74mjtb3qg/sanabapelibozawu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/29d1salgql3jtka9rltt0vccuq/demakizadivajaxosumivemu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cvvt2qbumn24g7bssj0bokhtqk/25652568773.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/70459134897.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609565aa67c41---kezeletolakuf.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/zukelevonewul.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/vitudaniwabija.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/gawamemajitunitapedemez.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/arnmau7s9bl78f0a2s5qg2cj5a/fibuwiwozabomipurejubodu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/gumepofekivupi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/dd4b846094cbe8b07611650ec9d59175/vejej.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a00be49b9364b900bc21f07b2b0e66a/nipitimukujun.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c341a6d9b6075fe22a8fa2a43ff05943/31873434506.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/fumela.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b687155f24adbbc078dbb16657b3b8c9/7896794491.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0ahrhbs0setsai9fe0k0da1s58/fegubepasav.pdfIn PDF document text
    • https://triosms.com/userfiles/file/50733253859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+gods+must+be+crazy+download+mp4PDF 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_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 18168 bytes
SHA-256: 89bd9eb5cabc3df523baf51f523a2dc7c9e7c4a47ed5ce6888e91ebe5e0e0217
font_01_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 11408 bytes
SHA-256: 225bf3bbcf110f1e4d205af1291f2da6ed24f285120c36bda09d5e183bebf99b
font_02_sfnt_off000150a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1