Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b57171ace4490a…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 04:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a74da6ae91b7e85bdea39e96e1ed0b59 SHA-1: 7fe66ac812c7c55f73719fe95263fe5f9d7e6ebf SHA-256: b5b57171ace4490af8ddc17ea2343be4dc73f8f2cc548d8d1b52d042e75f5fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate it's likely part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=the+retrieval+of+information+from+the+computer+is+defined+as PDF link annotation
    • https://metal-et-verre.ch/ckfinder/userfiles/files/zatujafuwaxaduw.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/reluvej.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083959e0afca---78481189966.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/43500931911.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/24244820135.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/91620861181.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/lumuxofedonurobe.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zulivobu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac5b2ab20---61050714439.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mb2a9njnif07jjcpu1un96p16k/91765986246.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/dujijifuvowilunewajonipe.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6ff880ed542d7378bf91d8dc3b6631a7/2543160165.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/23549969168.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160faaadf8f6e9---59088068027.pdfIn PDF document text
    • https://olterus.info/contents/files/39886404497.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210707032302.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c68636027---dajuretudekewofiwerube.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/163d3n0g24d9g98184g7cl7tgl/zugawulobegerigi.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/18263216044.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c52093c9b4---34437694795.pdfIn PDF document text
    • http://www.moyekolodin.com/files/71401753342.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f54fd022e---gamiwigakirafam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 18568 bytes
SHA-256: 5ff8271d00624b7da32680040466665d9f6d1970e106199cd7b1fa330222d480
font_01_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14262 11016 bytes
SHA-256: d7198239e9ebffa3ef19d0755b09263e2746c971074f6dca1b401e7bacdf8aeb

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