Malicious PDF — malware analysis report

Static analysis result for SHA-256 8220d4adad5b9ab7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3f7b3b68a48cb3ce154381c7789cb48 SHA-1: 452a9c5fe7e1417e215ce134297ffdeb4d243c33 SHA-256: 8220d4adad5b9ab765b84d5fb277e988793aff2a12bafbc89c3ec8918c75549e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, suggesting a link farm or redirection mechanism. The presence of these links and the hosting on potentially compromised infrastructure indicates an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ab4b68e6b7027f6f84292c104d82b67e/zijenegakebitejokuge.pdf In PDF document text
    • http://premsaktidal.in/userfiles/file/96167587466.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/559f3d2044ee315066f040be9475c545/papat.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/82145892820.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0b686bd48029670d349483861e38b17b/20514398494.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d301fe93---63165051806.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/mivawotubexekogatoz.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/vusokurebapomewimiwijotov.pdfIn PDF document text
    • https://noddy.nu/images/file/42537572711.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/70718408538.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/66881496798.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160cfff4e3a700---45689895983.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zifewosexugura.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0553f037---zoporazosinoj.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161039fc32a907---kewam.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mironebalufozuguwawi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8cf76884a2296a2481e2d077f5942707/zivujemawewarajebunewo.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/sawiveliborevuzafab.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/39045672827.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/126de314969346992ecfa5afc1ef5b65/32951004826.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/a771d9d0198c3574cca7e6bddcbb838e/98857947549.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/fiperaxibewumapowezuraru.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/lemuvuwoxevivunaxutibisum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=convert+from+word+to+pdf+onlinePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/55008115337.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_off0000b7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 16576 bytes
SHA-256: f51d1f9993df34a82d34836732cf75e277bd38454403bb9539ccd58b69306ec5
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 10512 bytes
SHA-256: fe540dfff193690cf27120097069b119b88e53760f5334a69687633a06a35843