Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a959aafc7c2e65…

MALICIOUS

PDF

94.0 KB Created: 2021-09-18 14:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3bd4e678e7ead3cedf4d5de111d5622 SHA-1: 52212df912b6880ac56424637d41a91065ab8c0d SHA-256: 66a959aafc7c2e65bf8dc26d50c2afa9ffc935c859c2545538579586df4acf67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://inwebjor.ru/uplcv?utm_term=get+out+full+movie+free+123 PDF link annotation
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/tikufini.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/getasofuworajejederubixe.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/82306346598.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/buwodopefagavotogegawunot.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/4586967083.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/xizufevudinamu.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83411783713.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387e1855fe0---xevawijeja.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/foxawevevoponisibu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/59523805780.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d05a88a43---96152726840.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/rizutelawajagemil.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/14120800855.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/worimep.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fbe76412---fubudexosalezud.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142259e0297e---60143107574.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jebodorufogezutilaleludi.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/50792476341.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/tisajabulexikereze.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/sodomadakavefudozosufuk.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/zafajenowuxajefojomanu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fofagunepoga.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/xudenilojanetapiwa.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/vuxiwajefulomotijilotus.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb9c06901---51387547024.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/43500356851.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614522a7daea8---dugoxu.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_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 17288 bytes
SHA-256: 857680bf9e6f7e431ca19c40625f7048af89a82ccbc25349c772cecc200e3014
font_01_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 10492 bytes
SHA-256: 62d5b9cb16c7ec5b4ce4e7fb687820e32141cfb9f5a451201eace30061d8eae3
font_02_sfnt_off00015320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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