Malicious PDF — malware analysis report

Static analysis result for SHA-256 3091e5649012db61…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 00:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 210605659eb47a6fc8d9ae3d4a4b8fd7 SHA-1: 598e424c8d43b703c035cde79d7d86061a174ce9 SHA-256: 3091e5649012db612e8e7cee9395dffa1fff87b23e0a513621786cb2b0a8b43b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a common PDF-based attack pattern that often involves JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=connect+exchange+outlook+android PDF link annotation
    • http://fst-uinsu.net/userfiles/files/25168288790.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/73828554976.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161367d7c22859---bagapufediwaludaju.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jitarimerol.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/17125153927.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/44682039680.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/38204674317.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/desejo.pdfIn PDF document text
    • https://zagi.hr/files/43375933128.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/66082798361.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/20109087929.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/loxorixag.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/kevufiduputiwomu.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/37970724652.pdfIn PDF document text
    • https://ka-base.no/images_students/files/66893057167.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/faniwopuve.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/71890009126.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/39584215202.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410dc5be468---57752237838.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/76815462614.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/41955695193.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2bb10c7af2ff5c80b11d111b9152c898/68578302473.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kalukakokuzuvaxenalobo.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_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 17168 bytes
SHA-256: f821804d7c57c4d03c503963012b254ea9639373a4d9a8ba66af62b2e3757aab
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 10808 bytes
SHA-256: 94c45651619d7d37c61c4ed06c4b035e49438eca18c7c1952eb314f84ecfa59a

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