Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98a614c2d35da23…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 11:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f550f62242f607a468351c9b5405ef2a SHA-1: 7174ee86bd77a2fa22b3dccc648604e50435b1bc SHA-256: c98a614c2d35da23d164b56f68777ffbf61b66edc473448645b3867048691e63
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sistemagestiondpr.com/userfiles/file/wejajiwodutalerekafife.pdf In PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/nixelezorubuvi.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/42624432370.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/zinonadesaleretorul.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/sitisiwowivunofalagaxesi.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/guzirizin.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/30749495525.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d359d3ca89---37395159996.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/fc9d6906f87d9848fb330f15b2038a88/26584198294.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/vatuxotonub.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/zozuxafuwovaja.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/11088566355.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/64634146459.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ecf000bc4bc6a68d3a40fb5fc21aaccd/dojepededidaxorinapovelov.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210913014356146.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/51600999973.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/af10d616bf42f80e2e4e7db462a315f4/78350210565.pdfIn PDF document text
    • https://pepsima.biz/files/file/xetorekiwusuto.pdfIn PDF document text
    • https://beaszemin.com/files/53491795258.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/wujapupaf.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/rukob.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/demugu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6a99d9695e814ac2008391406d56fe0e/90965581344.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/zadulawalisogetosazawife.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e7f0277---nufunakubulal.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/31938740265.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/jibebiperonikage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mapulani+mp4+free+downloadPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/numifixedovusemugonovod.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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 10648 bytes
SHA-256: d79bcad9c9b36f230d680b25cf289edb69ba23ff59fce23e9dcc250661e993a2
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 17776 bytes
SHA-256: 9d998b628bbefcce7f7338ca506033e5dadbb961df4781c52c3ac73400cc6933