Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e3c7a2464df98b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 08:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: becb5ceeacd2a2e4af83f38cb7149577 SHA-1: 15e2c4201da400a40107225af41624f3ec43e71e SHA-256: 76e3c7a2464df98b320e92eae48ffab50bf8afca9e7cf3b4c499682ae137be4d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://svarovanijelinek.cz/ckfinder/userfiles/files/witafu.pdf In PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/93264110657.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tegozirovo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8oq5n0j5iu2tgpt6n2u6o652va/vebigozobotikumatejaxafo.pdfIn PDF document text
    • http://humanlitech.com/files/files/60675950436.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/69d42945d6dc3026ff3be5126081597f/tefurufivalonuruxakopekeb.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e456b6cb11---90937451223.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/puderozevulunuvebefufupe.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/62588659663.pdfIn PDF document text
    • http://ipllaser.in/uploads/xofikoraxaposajozuro.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/12723512350.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/57017772904.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xodikoforala.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/dukim.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xadadoxiripezid.pdfIn PDF document text
    • http://state-lithium.com/upload/files/zokuleged.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/wukoribapitosoxoram.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/83945442487.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/35446878579.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/3270145523.pdfIn PDF document text
    • http://rooptex.com/uploads/59516497984.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/48103054864.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/22650164105.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130494c767a3---61458483613.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/liduwoxadomuxubapajujur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rojadirecta+android+gratisPDF 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_off0000bc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1A 10672 bytes
SHA-256: 5c2d761da11946f58e72ea5c1ab0d6627f4538d421f5a08eb5e649bad785cb88
font_01_sfnt_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 17860 bytes
SHA-256: a148c2cab0013548245b2b94df7bdec2f746ded8af392d2cdeb4ebb29cabc6e9
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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