Malicious PDF — malware analysis report

Static analysis result for SHA-256 582464cc1dd4e26e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 17:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e76df938f554a8832ade6d74c75b8b4d SHA-1: 71977b158903ac5f9156871bf2f2438fe450fd75 SHA-256: 582464cc1dd4e26ebdf6dbd649104ecb1a684f9142b4e95f633a5c6001b19fc9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves as a lure to redirect users to potentially malicious content.

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://landtop.com/filespath/files/20210912145615.pdf In PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/vunerufejepolemimavarekup.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/81813662635.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/96008962784.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2f62ce43f6e098174976581e587b904c/62016521334.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce8b052e7---pekojibugonano.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wuvifumudevubexidexavodu.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/37029616596.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/puzakujizip.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/39124528077.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/molovelofeliwisokugu.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/nidufu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/2760850915.pdfIn PDF document text
    • http://contextuae.com/resimler/files/putufugen.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/23432957036.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8b66ada6---binipikisopamen.pdfIn PDF document text
    • https://designclarf.it/file/76043909714.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c08844393a7ce0824371cd5119d3e494/83033365612.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913140201_a2F3ZWR1d2F0dQ==.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/88754035411.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/detibunorozad.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d9de5a21---dokivigevevegaxul.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/10749010312.pdfIn PDF document text
    • http://belv.ru/userfiles/file/5627337456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mx+takatak+app+download+apkPDF 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_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 10164 bytes
SHA-256: 27cccec1da817355ca06a6b67be61d01f4353c936b42edc79754089163eefac9
font_01_sfnt_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 17688 bytes
SHA-256: 44a1cd0a8ef7ac81521fb46783fa7b7c8a5f0df655463c10a2acfbf3d075b012
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1