Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e61e835e31ae86…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 01:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d191591f9af32951f834537eec5fa13a SHA-1: 803977be332f229a462ecf9ace900fc4beebf5c5 SHA-256: b6e61e835e31ae8680fb92ef4aade4406caf72c2a401ae21b815fd220452a5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious websites for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=red+shoes+and+the+seven+dwarfs+watch+online+free PDF link annotation
    • http://rockycheng.com/ckfinder/userfiles/files/dibagagigubonudenap.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/80832470270.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/15277952609.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/lojitigoramebijexu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f466b5bae9---63986422724.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/fevutugurevazi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7dc38e4226a7ee9b671bf9014c0b6844/fitutopoj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136aab5c2c31---15852338213.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/60072158029.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/13183242105.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/45011421492.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomeduku.pdfIn PDF document text
    • http://partnercable.com/files/gamuje.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/87995481706.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/64573733696.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41448378383.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/junojub.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/fuwaxowofelelosuroriju.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/80543782398.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1cb91f0d3ad087985cfa9a079ae260b8/sefoduwoga.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jowutofulipuxivejerutota.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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10772 bytes
SHA-256: a7d33271c32cc1471b66ea2a01a51047a846af08d70fce1a3f5a12896e398eed
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 18296 bytes
SHA-256: 3e1422248a8daeedf939f57039e56a73faa1dc52f5e37a77f12c5fd38f9d9bbd
font_02_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1