Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b51c540bed1632…

MALICIOUS

PDF

104.2 KB Created: 2021-07-16 22:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f4e2e654a322abf7f6076fe03b791a5 SHA-1: 8a1cf5a79a0c92af03fe4c4057588fd92eb376af SHA-256: 58b51c540bed1632ecea0aece08a319f228abb638440f1fbab84c39c1fbf56a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5971108d49942e35a6ac684be17ed68d/86691917249.pdf In PDF document text
    • http://technocom.pl/editor/file/54007833282.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/19368908875.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/duwevumerexadowedivaka.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/idn5pd1qpdduo97f2ijudn9g75/gotasuvemumi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199482471126.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/83718139fddf8d02a3f4eaa173d818ad/nitotobowakubepepeduzavug.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809427162bf---gipozilijoverakikiwapapet.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/02341ffdf3327768adeff72593ebf766/zetovuvadufiseferixunad.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918b704ce7b---35274255787.pdfIn PDF document text
    • https://icbacademy.com/upload/files/lerenorufinepux.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ae6194eb9bc1a9213de88ec3427583f2/50642175015.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/visiwepawasulupusi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/20d2f380e762846787650c130b31a6d4/22668626176.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ko646oe4atuj7943afa62e99t4/35993043783.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607965a1b1548---11786210033.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5f18d9d8---28178625180.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/domozutojakezadajixi.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/39094494844.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4a2b40c2b97c61a998509a961a81c965/27672675351.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tuwopozodosopafomevof.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/57698d363eea7e3332a00b62f754a9e2/10758860807.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0c5a0e5e7fb6eab728ed47d4a3451cff/64006469342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=offer+to+purchase+agreement+templatePDF 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_off0001337a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 17836 bytes
SHA-256: 0b2369a8d638f14bb144cba19ead695d1d710b5f2e6383b31153da74fe399721
font_01_sfnt_off00016221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A38 10960 bytes
SHA-256: f5f132eaf4753edfdf8e110668401370ccd772ec4422698fb0e769aaaf51a0f0

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