Malicious PDF — malware analysis report

Static analysis result for SHA-256 857b691768137b68…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 02:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bb3ae4045c895ebfc84fdac37868becb SHA-1: a5d67be795d8fec1db3b5100858a31dd099d2f76 SHA-256: 857b691768137b68fb5f6c6ff11da6f1ef9c2c55ba287c1e1d79488c2df0929d
162 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b26995d85e---45314378075.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d84a649948a31d26ac91b4b3ecd349be/39056860950.pdfIn PDF document text
    • https://alev.az/userfiles/file/73731283801.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/926241eaf5555ba812170b2a1b472707/98162076833.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/52767931357.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/575d90d2ce15c0c129cc04e98f149146/30563943011.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47ae62215---dobelabekikulorajupenuna.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16102c9c2ec65b---vijagumakakevewumus.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7410d18d1---73263021279.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/43354466560.pdfIn PDF document text
    • http://championsview.net/userimages/49795086493.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/gilij.pdfIn PDF document text
    • http://chamdure.com/DATA/files/20508048347.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/xetodujizole.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/90346236405.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b2d1f64d---fawododuniwepimij.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0b75d868a---nigazizefosajamogodove.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/43859783133.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9fbe45457dbcb6a871e1cb344b172d70/61692720709.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/34536151034.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/77609415610.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/14720326581.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/94549160869.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/neferoxuxuzodukifitamiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bacteriological+analytical+manual+fda+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.