Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd86bd5b1afb0c98…

MALICIOUS

PDF

93.2 KB Created: 2021-08-19 01:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d5e0b04bda3cb4ec4e6bd5f39c1ca68e SHA-1: cab59fc62123abc0f6203ce2cc7d15e332b2a1e0 SHA-256: fd86bd5b1afb0c984a6c032f7ecaa1d2d87fd81f28b9e1fbf492af50bb29d66b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lee-trading.tw/archive/upload/files/lopogevakulunadodinavuli.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6ee90ce6f6a568bc8ae6f50d4bb7c295/42471296721.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/89153983491.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vorogido.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dnkd1rco6eh42bmeb5d7hnkdh4/67305044404.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17b46d41a---fasujodanuvo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704f0198644---labaziweve.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16077544aded69---virixowetifumizamusi.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/91157684197.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c9496eb1aee0ee094369f650358be2f2/roloxevobezugi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/87652539354.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/vopogi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/regeguxilegajoxulakewo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bee92f3d9---katamidozanizadap.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/nojojamuvaragawuzo.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/sivuwabo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2f0726d903d5d3c9219116b7bbc8fa7a/dasives.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b5b2948ed---60767519879.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/72455498902.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/3tts1o8pfb25kfisrktg5h1qc6/49509890909.pdfIn PDF document text
    • http://cwesp.biz/upload/file/40821955345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=amsco+ap+world+history+answer+key+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/10c557eb7f1fa0d8fa0a1580933da4b9/jabatarexeneder.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 17232 bytes
SHA-256: 0982c163bcdbd28e754a6bf480d4c63d963321a65f3970c01ee101b8d6190f13
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 11156 bytes
SHA-256: ed66199feb9684fba440f46f45c482356f146aac076e6849f2e32fcf3c2d3968
font_03_sfnt_off00014e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E80 16448 bytes
SHA-256: 3769889bac2ab0d35afefa3e7b76da7c8a86b8c0668ee488eabd27a71e5946e8

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