Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e909f89c58e5d91…

MALICIOUS

PDF

68.5 KB Created: 2021-09-07 08:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c139eabc696383326e327c2b06194de5 SHA-1: 8af62264542d20ebe4d19026630a9f7c3919e241 SHA-256: 2e909f89c58e5d918349be4c14d271191684f90b4145e9ee97a99205be1ec684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically flagged as phishing or a trojan. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. The PDF's structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://abwmarlboropike.com/uploads/files/76621240886.pdf In PDF document text
    • http://alconburyreunion.com/clients/36523/File/64106868432.pdfIn PDF document text
    • https://t2sc.me/userfiles/zimavotemumoropisodavawu.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/44002542966.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/gamosakowezemekatawene.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/tofujowa.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe0260f76---gopokivudat.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a02eb80bf---21362759924.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bbc5efe1d08798ca0b899d6cc98f430c/4863268184.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfb7f293e296f286ec090e27ae03819f/87599769928.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/sexubetupufanilu.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/vobamulaxadasida.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/difirasitabesatogib.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/vagusuwodofinezaw.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/noluv.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea24d955a7---10001927301.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef9d498ad---lijumetofiwumuribopilufif.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a078b910f---85252757479.pdfIn PDF document text
    • http://www.bandungmesin.com/file/kunip.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/51579307729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scion+im+manual+transmission+for+salePDF 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_off0000ad53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD53 15200 bytes
SHA-256: efe9702a6cc0bd65e347627e4bb0406354f5f1de2191d6518ab36fd049122f77
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 10672 bytes
SHA-256: 7271eb0a446fd61c839a3feb3f0de538be5285131cae729bd29b586e6b97c6b5
font_02_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1