Malicious PDF — malware analysis report

Static analysis result for SHA-256 40195ddbc5a4bb8b…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 22:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acb3b84f0fef352e940c89ccc11cfcb3 SHA-1: 3f69c5d2adcbaef1ed0c8d3734b0a38b8699ffe2 SHA-256: 40195ddbc5a4bb8b38fc200700d1882f4d0486af0e62fd1eaa906aa95ae64e8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The sample also features numerous links to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amatnieks.com/pictures/image/13518139216.pdf In PDF document text
    • http://dongshengcable.com/images/upload/File/foluzepotowow.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/mudezovaf.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sfvf49eteg7v5jq9g73njbr0pe/witazukow.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce9b2634c---47215087038.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/60069494514.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/68420662723.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/87075179333.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/53509456835.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/kesowewalagadepoxakunuda.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/12307233338.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/nigijefig.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e7688a5a---xatobakawavibove.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/91271886327.pdfIn PDF document text
    • https://sanagustin.cl/files/xurix.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/pinuberivasujopinasosu.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bexepagusamitox.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210902_FA3842F165C282F9.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/kgv0f6trbkmfusou05l1j4racd/sivelawimowox.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794345595a8---98849460457.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/tibikituteramoluzor.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/debimuzosuzafug.pdfIn PDF document text
    • https://masihpt1.com/contents//files/9017379643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=afterglow+headset+xbox+one+manualPDF 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_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 11120 bytes
SHA-256: 38839d055a8dccdda123707fc5183814c8af270d5af01e0088f5171689c36ff2
font_01_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 19032 bytes
SHA-256: b2e9fb374d25c75e6e9d2fc683edab69fef05f49d6e590355ae8c2c399f88606