Malicious PDF — malware analysis report

Static analysis result for SHA-256 397afa31b526e43c…

MALICIOUS

PDF

85.5 KB Created: 2021-08-17 21:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86a42801107e623c9d8db81b0cb63d24 SHA-1: 62b4483c419f822404a701309cf980202b4cd2e9 SHA-256: 397afa31b526e43c86aea5a866314ff71a46db89113c20ad26bcfff8944b9629
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=mortal+kombat+3+izle+t%C3%BCrk%C3%A7e+dublaj+720p PDF link annotation
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2d371cc2---42964157911.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050314555011.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vemamatanulibunug.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/gevuxuwezesoxebek.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/685fa497d3d0c65cc52826e3902825f0/28471560863.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/sadefadanu.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/sukosupuzuwukabuzir.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/17694557003.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qm84um5pjsenghdmdtppk0t1mi/kufopegetudinemeza.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/fupetux.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vapunegatuxeku.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4107dd64bc---nalis.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/83852261538.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ad3d8842339761370444722504c47854/fosudunomok.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4baab411d00e03de3725ede98c328147/lijodujawi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210524004811_731785958.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7981e30c---89315825173.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32f527cb725027aacfc0b90f12f2abb0/moritekinaf.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3e8a9084---68441357711.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e97dbc06028---57953725209.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/huv84ntimh5b3j763206iu0g82/84119436515.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/37684602227.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 18708 bytes
SHA-256: 82669c4be090fdb8c58125c8e1c87a1be5234401b9861b16f1f3495e407fac75
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 11652 bytes
SHA-256: 09ba9cd2da7bbbcb5ba021d828d669d67c0505dfd221f8ac206cf3a4ac906908

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