Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76c6bec3fc60a02…

MALICIOUS

PDF

71.8 KB Created: 2021-07-27 17:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8d198de2d92c59b2366d1604f593251e SHA-1: cd9d4d56db53801c986f31e7dd0d94498bcc0d08 SHA-256: d76c6bec3fc60a029f56b924e7d85124af481c77fcbea6dc9bf0adb669f7792a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e783423cd---jusafopanolagujurile.pdf In PDF document text
    • https://coatielectronica.com/files/12096208860.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5faa2e70e---levunedes.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983065821cf---58590471579.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/fefivaz.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/radawekenevovodipo.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/papurufagoxixarezi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997d89f3e27---46981376008.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xawivap.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/majuwikod.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/jukuvabom.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/jijudepesulutiwetaxet.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/towakefezuwotozo.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/ferowojigigarufotized.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/81067049871.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l30cuvcjofo2hkan68vb8ehpk0/nerubuvapufalogizoj.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/igu2vkmb33t0f7ruvfcmaok26h/42002344814.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c4dc15f13d1dd26881b2055adec4468f/mibuvisedademozizo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d052b0c623---wozanexusi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074093dc5aa8---78851765610.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073540e03a4e---34591662187.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/79341669822.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061915527_711613528.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/bf8586124edcc4bd13087abdd9ff148a/tegijipovik.pdfIn PDF document text
    • http://dalaichau.com/files/53405182735.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/miwanijozomut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+calculate+friction+on+an+inclined+planePDF link annotation
    • 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_off0000bbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC2 10620 bytes
SHA-256: d0904070e3f1d28a3ca6e6ecb913f97509d6feb3340503b4518eb8cc852d5b79
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 14464 bytes
SHA-256: 1f0c3c86e52674f2f48211f1948138f34c85232ba2c2cb4be284a77ac1bc1448
font_02_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1