Malicious PDF — malware analysis report

Static analysis result for SHA-256 168b3f629e1f05e8…

MALICIOUS

PDF

75.0 KB Created: 2021-08-05 01:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 224c4d992278097e406c513589ec3703 SHA-1: 20954e5f7840660a843972738fd286212967d837 SHA-256: 168b3f629e1f05e861f96d2a00cf33ca5250e4625e1076dbdfd5021758169b51
154 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 0.8784

Heuristics 5

  • 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.
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/85e9833fa16ee69e094330b4d365f497/47298521305.pdf In PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/61i8bu8p8og7qcddfh8jito1c9/47032847422.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///60116594717.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/76838436119.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/5231880640.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/rugopobofotizofajeramofip.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/87bee804d62e5b6c978f2149eb7ce13c/zuxokeratinid.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab00d38fbe3---vagelenejikofub.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21f976385---suruvi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2pa5hr8i4kc25v9lm9g4aoc9n6/raxexogusobarofezupokif.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2085ac60d37f69b2a8af30eb35863acb/bijogusitomamatomurijose.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/fatixisa.pdfIn PDF document text
    • http://mvpvo.ru/userfiles/file/1826928647.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/54081747370.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2honkc93uaqfe6tp4pdctavr4h/sirodesokunemal.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b566a182eaad7028a6561d7c20a231cf/53795294974.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/npdnk4ep4hjhufdspsipt0vgdc/7234826683.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/79779822722.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/39051574272.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca1056bc9---pijepilabeninul.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/5b840d29954f80d0c9a0658f847cdca4/zavezubejokivaruxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=solid+liquid+gas+worksheet+grade+3+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 17152 bytes
SHA-256: 287716a9b6527afa3599bcf767e09432fb7c095b62b120b8e204febf72a4d8c2

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