Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c53724ca1b2fe5c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 13:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7447339fc0ec7cee0017eb58ccfecc2c SHA-1: 2f556fab20dc71f50c5319067d92f07ea3577e88 SHA-256: 0c53724ca1b2fe5c79c6ab4af4fc90da66da127bbfc4771cd32909437313de3b
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 websites that appear to be part of a link farm or hosted on compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple links on potentially compromised or disposable domains suggests a campaign to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://fitviewer.biz/files/file/futamebaz.pdf In PDF document text
    • https://tarzminder.com/resimler/files/28292867385.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b80401ce2---rotugezuremenokigega.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jccgj3b7vq75llmv84fc3kus9n/gidebetefelomurezu.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/kijorisisesiz.pdfIn PDF document text
    • https://steammining.com/userfiles/file/zolizawufujolapevuzakitut.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/zoliguzojebegenasuvujub.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/65391930879.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090907060051.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/26597684539.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/1208699722.pdfIn PDF document text
    • http://baove247.org/upload/files/13140468161.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/56482396223.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/woranewazufofozopibugefa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb2a84a8c---movupexuroso.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/94366511468.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/bofumilotinajugidi.pdfIn PDF document text
    • https://thehouseproduction.net/file/66610413910.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e5ace83d51e4d5a6b1f55ecda579e2b5/508988442.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/91718071245.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd43294bed---33432087177.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/46330006529.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/84302613970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=do+i+need+sync+on+my+phonePDF 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_off0000bd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 10488 bytes
SHA-256: 012992b629b9e78db62d8a2e4fecfe78389f80729c3eba07003d417bf9702fd9
font_01_sfnt_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 16192 bytes
SHA-256: 10c834f1d452853c461efebc3f698cb1c1b9d60058aefa71601855f878d6e3bb
font_02_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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