Malicious PDF — malware analysis report

Static analysis result for SHA-256 1059e310f2936a45…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 23:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 662199b390fc16ec580d64e883483f5c SHA-1: e97d5b9d0652c5a88c6832c8aa19910933956b7e SHA-256: 1059e310f2936a4591eeab59a20d9369f437df763deae9700a8777bf3a4f8628
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users to malicious content. The heuristic 'SE_URGENCY_LURE' was also triggered, indicating the document may contain language designed to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=the+merchant+of+venice+questions+and+answers+pdf PDF link annotation
    • http://icbiz.ru/userfiles/file/4414320279.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/misoxogefenopuwo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb77fe6a08---pesulu.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/borikixe.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gozuvijotat.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3c29bcf1---jadedilegazu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/77b3128cc4a4a8f5eb3760d9404dc856/bizubefodidexegigorowedig.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ok1ch43r2fulmuetve3bgm08q7/tinomowe.pdfIn PDF document text
    • http://edgecs.net/documents/nepem.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9d1c479575ebaeb115f803b0941078cd/63997331939.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ac152ebb---parewobepagiridofonig.pdfIn PDF document text
    • http://ranch.pl/files/file/9040119631.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/29097783387.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/tufenebizoselukix.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/metologofudowowevaler.pdfIn PDF document text
    • http://www.bash.cl/media/file/vajofavorudeviwexabiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec9125c8b---zovavuveretezozimisub.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/xidarovakemawotobexor.pdfIn PDF document text
    • https://curvy.tw/upload/files/27162819448.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/62465699873.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/91121683142.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07c650e776---39017965574.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/21dc76b958b47c355b9a39c4c15e0fe9/dojorefej.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/wejikepinetafopadarutim.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/21805730309.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 11200 bytes
SHA-256: 196366e4d37ffb51c64d5df136436747dbd751d917843e7a7c3ae166a5c75ae0
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 17360 bytes
SHA-256: e9fa8e27720f9f7ea8ce83d40a1e957a47128e88e07ed749362f74009c25841e

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