Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b83c1381d15b0c5…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 07:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3bdc8adabf54325eec83aafc26badea7 SHA-1: 875a850d80d532f6036b11dc45a0bd391d0560bd SHA-256: 5b83c1381d15b0c5928651835f1a11e3c607fbf4bcc9367954b5d7338b5b7ec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=how+to+decrease+quality+of+pdf PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86baa30d3fc6d1888b0f5eb2cd1d2451/pudaxabo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/abd5de6a1c7d127032783f96883a062f/xuxeresamedupoxabafev.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/207e5dad96f32ce0e98aaabed0177edb/nowoberemegok.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/42477067484.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8861b106a4---segelomaneragosadilani.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b00720ca---65748871604.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c961162993d61cc195b198a416250c21/65668101381.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/65326074346.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/27162799255.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/28145395357.pdfIn PDF document text
    • http://vtaky.sk/media/file/7072588076.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/80284273785.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/akjbnhe3u3aftcj14uiquobn19/fesoxifixibitaseguzezeno.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xewuvalusefezowiwufewufur.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/43746644188.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942915e7bfb---41250738558.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/05a6d6e16147369f36bfc7ebc63c074b/zifunusoranomegivafab.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ee8c044e---78445212808.pdfIn PDF document text
    • http://orrizon.ru/images/file/2513520078.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/repegowabijilibuxuzija.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zuxoviridinuroxajedorafiv.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/jazakizuko.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106212029088116.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be897ce256a---62249287255.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607717d61c299---gigobuxibitaresiriri.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10944 bytes
SHA-256: 5111a30fd0e5b8cad4fb84c6955ebab5c5e1e47eb748060a775a9cf0a381e7a0
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 17508 bytes
SHA-256: 3468e617439287342dca9cce35d1f8fe14c039b3d4ab64398b789f5ba09cfc65
font_02_sfnt_off000131dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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