Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e98b25bdb5d836…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 10:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8aa6794e22663ece2d62aecdb1ec07b4 SHA-1: 7692e3e1fcce54bf631c53661dd37011e1767d0e SHA-256: d7e98b25bdb5d8361e1f0c9224e697cd052a53f962ba2d2a3c8f47f633066f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://queure.ru/uplcv?utm_term=teoria+humanista+concepto+pdf PDF link annotation
    • http://narcisse.sk/editor_uploads/files/1489120302.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/lesuvedew.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/xerovepexirerilebo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c2ef32d7---kazexozepopizizaw.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n9uniqaoi1uccfkqgiriah4bp1/53017759114.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/42694947731.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/14rv03mk2egeosb83fs5jo7ir5/70402448140.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ama3pfpjtfh7ttnj65khtgupbs/62130989411.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/pomutamirorek.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/perosonenazunob.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0fc08e7d26ddf6e9d540b10292a7e3c2/vebuwubijepuza.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/70kof2cp0t0j085qp9j3kac80a/61628091561.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db993b2b3c---5652553096.pdfIn PDF document text
    • http://veitali.com/upload/files/57548176816.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/xusuzedobimarudu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7484dceaf1---tetubegapi.pdfIn PDF document text
    • https://kawanmto.net/contents/files/43661792950.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/dipexatolowozexel.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/74989534573.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/87345922957.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wuzenaragovaxozofe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50248205465.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/38993589378.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210822_064805.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/zexuxoximerabujaf.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612682d507be0---midojewoxavesix.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f615e2ab1b33e90ee095533701637ba3/jovelijujudodinovid.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_off0000bba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 15720 bytes
SHA-256: b00b15998247018d6e483ff4eeca7e23b4ef264a4b28f3c46fd06eea608c3679
font_02_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10904 bytes
SHA-256: 3a5bb6ac48e309a10479e37188c2727cdf2c7bec943f166f668913c523c6f818

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