Malicious PDF — malware analysis report

Static analysis result for SHA-256 340ea42b18a9a9d6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 19:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cfde237a8ec7e298da542882f6a9d2fe SHA-1: 2a0224318722ce2d2682d7893267de09a1829c67 SHA-256: 340ea42b18a9a9d6b94a8579f33c0a2fd8342796dc153765dc2f12b580678740
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, with numerous distinct hosts. The embedded URLs suggest an attempt to direct the user to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6ebeb45363c4737427d20536bf901aa1/92401321640.pdf In PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/zejatuzuxixozeralalipujeg.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bcea24bb7d1---24955624755.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da79384c1d---25937930534.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099de52775d4---jaroxotoju.pdfIn PDF document text
    • http://crediramasrl.it/public/file/tesiguvu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/lexonizujidupunesutokum.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/11801567899.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/wupiti.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/67395750442.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/1065950726.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104a7f743d66---zosiguxulebotizuke.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/bokikagajisufaforag.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/lurubotinuvabalogizul.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d1961d31---wiruxovarejumesosu.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/sigexopino.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a508d4b1cf---6703177669.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b050bc55f---40993858293.pdfIn PDF document text
    • http://promador.pl/userfiles/file/89501061232.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/18784637081.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fb73d8852b04bf34ae1f5b04c1f18a71/73668824973.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106281237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fortnightly+meaning+in+malayalamPDF 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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 19640 bytes
SHA-256: 13c5c0dd231f096478597afcb40b14240a29294606b3457c4f0c1ae032a62367
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10476 bytes
SHA-256: 911b29534bedbbd2b27c89ba1ad465ca3c78997e2010a6a152265a2e70432562
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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