Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cfdc9b2174c841…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 09:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e8303c585742a57b9aaa333d0de35b6 SHA-1: 172d3b1bc49dfe661cc9e7ed29b0d3692f490912 SHA-256: 48cfdc9b2174c841996669d8f9837c191cf010ae0b83d2e86e24020cdfb232de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The file's structure and URL patterns are consistent with known phishing campaigns that leverage compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/754d6d18a57d38ad889c9f75c5569246/81850216959.pdf In PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/8e3f302a8005c1cb3761895b34c48f75/sajefuzug.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b0cf32e56b29b60758dee9940a19c862/lexujeriporolasug.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/sj71en0fbn862is3sokvof5d6g/benufarivezaroraziz.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/24223203006.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea1f37f61---wozab.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/davatubunelaxise.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/vopotasitetiwo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xesubemifar.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9ccaaecc---fexedamukopifikenosunonu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vtijk3masgo8csme8mmouovh04/minafoxujulop.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17692898675.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2ea8bc04---rotegem.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d1540bad---zofifotuwopebazis.pdfIn PDF document text
    • http://xycrusher.com/d/files/78401817162.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/wuradugojojisew.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/37653023186.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6a5d5f10---11231798023.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd23cd107---bulegejidewen.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4e26814116c16ed79cc5d416f1ae83d6/kurofutebunurole.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2acd23d4a---jegebinajituxixemidijiv.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/22979203022.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/vqtg1hudiunqlnnq0mv2vi5uvf/68979329586.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/01cd8de4caa8928e3b18348f8bedfe1c/95388819303.pdfIn PDF document text
    • http://group.chem.iastIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=predicting+single+replacement+reactionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 10856 bytes
SHA-256: 3adc54e477a6155f36f797a7e61deca366e940bfe0056e594cc394ac028c8b85
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16884 bytes
SHA-256: eb856d623724418d852353e6b3906d1b27d9cea9b867f41fb1aa7259418f8d47
font_03_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68