Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aa7bdcb3043bbe…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 08:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6a55078c4b7361c352727cbaf7cfe73 SHA-1: 1fc6ac671dbcde4df56840f296e5d0b455b4c119 SHA-256: 81aa7bdcb3043bbe69d075c7a85ba33ca4022e9f15721bc3d2601bae7836fb10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely lead to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://inwebjor.ru/uplcv?utm_term=v2art+video+effects+and+filters+pro+apk PDF link annotation
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5038e86c663c0d31b64fdc59f6af0c56/batutiniga.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/25deb868f809c33e7cb770f4a56d2396/87957462079.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b174bf694---17326328041.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec4625f8e0839932b4fad613a08068bc/tidovimiwuxolumir.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/67606381879.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5245fae5d9---devuwaxokuvit.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e0bcf754---53121405768.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1pbahdku88pt091ftqrlpb5lb7/kisoguteg.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cabcf2aab0a---nosepojamunekugadufa.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/26luurnl53jmf8rc92ejka138j/gapesa.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/kawixuguvononopuso.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/buwovakesaxuxiduzajazo.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/33289581102.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/17097fe49f5bf32cdd50be845bad485a/pezedixugifanufas.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d5fda01b2bf7a24218c0c76fa290bdd5/73280361340.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/742a12a7cf8cb3960a3eb698fedf2f7e/kogixurap.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/760e7691800d59ea1c5014731e300d02/23235698800.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/16682036277.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d43818d02---suluxuwetofedeb.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/8087084541.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7f9e5cd9---manuvititivipodofube.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d116d5c45---38203304782.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d88a6f5ac67---20660776916.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10860 bytes
SHA-256: ad920ed2bbb7bce290bdaee967f926d8e60325446d254442bb55734e019328fc
font_03_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 16808 bytes
SHA-256: 1c8ebe0a5500c812794a47d7c7544c546ba7739ffbdd7a882accdd7381525694

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