Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20b1ed01b3cdcc5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 03:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19ed775a348aa0f1867500f5416f6ad5 SHA-1: 93d5a908d098967a19a50c2f51808d8351792caf SHA-256: e20b1ed01b3cdcc557a1eaf629a6275ac9ab698b42c95584467c5fb7e9a91863
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://bitree.net/ckfinder/userfiles/files/kaxenodezupab.pdf In PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7d676e96db0642fa717c96c47d7cdd04/zumagudomokovapuju.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d4db4fe62323ea114afa1782d7f3d997/rubufuzigamosoxozewaviv.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/28993416221.pdfIn PDF document text
    • https://wonkingchina.com/d/files/9479356417.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02e3e1982---wedunimawuribizi.pdfIn PDF document text
    • https://anfauglir.com/images/file/6213352311.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/51726723526.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/61849821915.pdfIn PDF document text
    • http://goldia.cz/data/file/54554766779.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/75291130777.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/nasusapesilatalemitefo.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/26251754819.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/silonojeguj.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610046bb6d32f---45294121179.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/12438273741.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/mabewokesiraguxoja.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/juxigowowamomitubazum.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/49888664764.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/96d689c861e2161794f9e007e160a012/pobiviwirewok.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/zizumepegapugivagadobin.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161145db858b2f---32352236114.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/liwavetibefomedilovomano.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210618034334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=transamination+mechanism+pdfPDF 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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10800 bytes
SHA-256: 07deaa799d3bf70d2645902112461caae7773bc47460e8aa7b6a4c519bbd5b3e
font_02_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 18500 bytes
SHA-256: b15e79e2891c2eb126e1399c1b1de04ef35b192ad16808c6856271b640ffdd17

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