Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21f2bbf97c6306f…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 08:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a279c9ff2716ef86afa4b76300c3d9ee SHA-1: 8a99733eb37515e865f363e773e1656bc3f0e3e9 SHA-256: d21f2bbf97c6306f8cd49c0c63a2f39930d52989890d2c521980bf40011a3cf1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/606f7d2c37407c7d0ec8851c6555ab93/vubopojiruxusinidonamako.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075faf7e34fd---gowuritixitolasolulawuri.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/44837817931.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1527ebbea3e8c25b2d0f9fbe5e079c02/mavikudizajopebapizo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe8ee4e636---29165473386.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/75753127547.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8aa139d9---durujatunujupegis.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/vewap.pdfIn PDF document text
    • http://meta-min.com/files/sibimelizepo.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gevoxepetizufinuwo.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/21303551766.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/tofukifitefalevenejidexi.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/kisogodofasomoni.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0514bb8c---21699716142.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/757e31c3628b8dab613f119bbab60687/55243945655.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rhll81u67fcvq44kfngrmibj3c/zewesomevujinomawevebute.pdfIn PDF document text
    • http://capri.lt/userfiles/files/16631393380.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7250da300---59060498943.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/79852799704.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24efc681f---96029053398.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a73b1fd0---87659672770.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/benejutesoz.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lmsvbrnla1hi8q8ai8ioascjr9/jabonuwutafomib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=functional+implementation+in+strategic+managementPDF 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_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 10792 bytes
SHA-256: 62fe4b1d3247ee10ec6e53c80cfc65821d13c70d36d55cc9c804fb326e79aaab
font_01_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 17104 bytes
SHA-256: 189f30ca5e83ee6ce58568408ed5611ddb77943f150ec8cf2a3c0fda6ca680ca

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