Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf7f8e5250e9a3c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-14 14:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be8208b6cf17f100092b7673e2584bc5 SHA-1: 1521e0a0b3458ea5b7936c6912137eccab92affc SHA-256: 8bf7f8e5250e9a3cf7b67942c5770689a43b13f8963171e091bade59366d5e59
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The primary attack pattern involves luring users to external sites via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=android+low+volume+bluetooth PDF link annotation
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321a7c94b04---9623640496.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/24139856268.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gojepifavopobesezemusakaj.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/23913166492.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/99679168612.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/55933675308.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/73713114597.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/jofamosoxamopobinod.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/24119474073.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee12512bf---68591408671.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f313fab5---sufitubegepozik.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b66aa20c7c32899506db7ed6253faaaf/72268359803.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210910060242.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/tejaxan.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/bobitegomubetobobolugu.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/5814148445.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16309985191893085519.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137e6dedda28---zujukamig.pdfIn PDF document text
    • http://ailizia.com/userfiles/sikarejekasokobi.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/87215238763.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/1487379078.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/joxovugabiradagubamanaxer.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61843109023.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/baxaxajikutam.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_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 19092 bytes
SHA-256: 4625c3aaacd84053414edc4c59230c82c81e2784ccbe37275fa17607ce4e6dea
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE0 10556 bytes
SHA-256: 2cad28c6ffc24883e289cf5d5cf51f65c63e9dfc3894718afb4e036a311d4b57