Malicious PDF — malware analysis report

Static analysis result for SHA-256 103a505b4d6e861c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-04 07:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9de7c2eb854e64baee345860f54a069 SHA-1: 16512d2bc267432451787b7180f7c5f131c004f7 SHA-256: 103a505b4d6e861cc0caa01fba52098ce0ff6a0812ebd9cd6fbade6903e76437
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to host or link to malicious content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://ankurgroups.com/userfiles/file/luburodapujoxabunizofuvu.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4c7a2fda9ea81e549f0c649af3a1c888/60838930089.pdfIn PDF document text
    • http://rafaelokazakov.com/file/7939524309.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084365940442---76321226037.pdfIn PDF document text
    • http://platcometals.com/images/file/jugen.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wagedesutovozebob.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4654c82307---lidogup.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/i00m329dhaso2rl8g89k2nvd26/33170043090.pdfIn PDF document text
    • http://vanhacollection.com/images/files/53302179045.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/96112994161.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/kitezuzununofafim.pdfIn PDF document text
    • http://esejsc.com/upload/files/88775110875.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e672ac214f---45063703319.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/2497452032.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/sanolisepi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75cfdc719---tebojimoguju.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796c78edde9---kinojikojiji.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bivukililupusuxuzude.pdfIn PDF document text
    • http://mega.kz/media/upload/files/8590633874.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kodozizijedajoru.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/528db3f4e7a6de18d0382c0071f2eacc/87214207999.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gulilun.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/16213396635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=banting+diet+meals+pdfPDF 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_off0000b2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B8 15444 bytes
SHA-256: e29c9924d67b12955d59167be9ad94cf9902dfba03ac696bfcd6e616d31be7ab
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10672 bytes
SHA-256: a592456e1dba8817a57772f8deff456655f23145d38056ecf8321ff2ef04afac

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