Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc16e7410690c39…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 04:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85439c0d6d0e59cae384d47bec291a79 SHA-1: bf390c47b5b78eacf6442fa7f57ea11f9e566a16 SHA-256: 2cc16e7410690c39b7d0e940a54f0c50fd4d4531a34c5302fac3ea054fc017a3
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://bannermaul.com/userData/board/file/nidofogowewiwonowip.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2adc01df6d41a68deab383e6faf26206/kinotazelanalaginob.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/rajema.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/28131463747.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079655df073c---88555659407.pdfIn PDF document text
    • http://xenangheli.vn/public/files/kazusaxosalu.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/wojepefaja.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/96789200126.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/25729912434.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zugizo.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/17039626057.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///32136147979.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/bekam.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/puvumuzaxepof.pdfIn PDF document text
    • https://rosycaffe.com/file/82250670626.pdfIn PDF document text
    • https://angkagenap.com/contents//files/45269803843.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/49544624398.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/felinuzabafopa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/91c7d0c358556b6189ad8564b2b8e75d/wofibitezaxobazulawowigas.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d2de36b2---satolodatedowe.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/genogaroni.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160836e22abe38---69782692663.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/84f4f00f165a8f461fb36ead310594bc/60792834952.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/3vpfee88297o2diejea0e1ohi6/sedusowovudekume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=third+edition+solution+upper+intermediate+workbook+answersPDF 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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 11040 bytes
SHA-256: 439df7e89abe5389515235db14fe8f404ec00783965e1a5ac4d4585feb390f90
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 17876 bytes
SHA-256: dc9303fc1b1a7ca3f0528daeb4852e9bdc0a6336c73d5a6aa1a2ba39055726d4