Malicious PDF — malware analysis report

Static analysis result for SHA-256 201664de927c2ded…

MALICIOUS

PDF

81.9 KB Created: 2021-08-03 07:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c50aae6c70dedfbb7935f1ac6bea6029 SHA-1: 2a01a9023d74e41a86944d83df25d6b6a7f9ec75 SHA-256: 201664de927c2dedf91d134a0c52f9c7b1fc2fc20cf994c821d870c35d507b1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URI heuristics and link farm indicators strongly suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medvor.ru/uplcv?utm_term=avoiding+double+negatives+worksheet+answer+key PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/67c7a3bd94be17f8872c405495cc6b7f/keperoluwozefenote.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117f30ea64---lozuj.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/gebarujozowid.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fafinopewetinepobi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/sanokepuxi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/96fc6ae96bd483a45035de0927ddbf90/7304450881.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/turijosimofo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21ef99cae7---52889626851.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/29820465172.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887304cfe22---zenedorimoka.pdfIn PDF document text
    • http://heizler.hu/files/file/jidiwagigakagizezijobe.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/93470603556.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zafudejuvogumobugiligiwe.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/57215884132.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1246e3f95a---majusama.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ef246037---litalowesuwigivutujetapi.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/lezawuxoxil.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d41cdd3d5---risefajara.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6bba7105d6bb2ec1190d840f5dd71004/terajigujo.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/72103728605.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/tovujuzerukoxa.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5aaad0500---fivitugusowajemexemefepa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835d706bcb---rosevefuko.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a081a6ac521---kupuruxel.pdfIn PDF document text
    • 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16444 bytes
SHA-256: 186c33c242687a8b75ccd78660118cd470edbc12670de1ec5252d534df9fce59
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 11104 bytes
SHA-256: 1a25a69020fca0ce579091507206491ce63d4f3fddc1c748771484f113d3af58
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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