Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bc1ebb4b38f400…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 14:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eee7a206feb26cde848ca36279057af SHA-1: c6a6c30badf853384334166e4cec763c09ea8821 SHA-256: 32bc1ebb4b38f4008d42f5120924c6a737c2e8cdea20b3d9ce227b009110e772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed a link farm structure with numerous URLs pointing to disposable hosting, designed to trick users into downloading further content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kingtonkatsu.com/uploads/files/98656894844.pdf In PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/65987936751.pdfIn PDF document text
    • https://felicityokolo.com/file/badaxokizudobijov.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dewetog.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/76528096933.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/89806140501.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/detemufusajoludixagojoka.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/xumefubofamugajir.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602c9947f3---wilag.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/lafaxijag.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/40062279762.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/12488298404.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pvevrun35fg1do4uo87vvabp35/92820358225.pdfIn PDF document text
    • http://chineseclothingonline.net/File/23323113077.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/zenopez.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/morelevafoxizosetava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e7fef4df---deriteluxiruzuvumanijilaz.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/lorejejomubisibuz.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/38283370877.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/20102484088.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/tumig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=o2tvseries+free+downloadPDF 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_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 10644 bytes
SHA-256: ac080ee745e395e665c319483d65b9e6c192354ec583e875f48d846c99633f62
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 17452 bytes
SHA-256: 5ba4a1ae881747c10ce7d0301102b4955607282260a459f1d6a0e8f4a7545fe1