Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c4217308e1fa08…

MALICIOUS

PDF

110.6 KB Created: 2021-07-07 01:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc29876800270be9996eda4b80b3a8a7 SHA-1: b451988896cc0bd1d73891f9b8a772092cae6270 SHA-256: 27c4217308e1fa08cf065655dcc0e416c30cda9a6da907061a2f20438fb8edde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://irlanc.ru/uplcv?utm_term=heart+of+darkness+introduction+pdf PDF link annotation
    • http://toyotarent.kr/FileData/ckfinder/files/20210615_10BB0307C24E5A29.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c928c373ae---bezasakubedek.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3227f3c878---pidatarajum.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/78010406d7f728cac3f49b8a04b4fb5d/papurapuvonedurumaje.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/8153640405.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/7894567685.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/38736646541.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf4e2f7d3---puduzeperutol.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/vemaperimugobopu.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/28859490442.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/93884287253.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f4bc93658edf3130940d013e7aa59327/puvuverunokuru.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2ffc5bcabe5516b8341572b39deb0709/gupotukuvepalob.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/mvpvqm4uvddqaq558ea3h0as3j/30870115003.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd85156ba---12195849838.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r18ojv2gh7shlm4i02b71b62m2/jozuxibat.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b749cddb232---18197111390.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840fb28caaf---57456624396.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072196e89009---jikasuwejakolaxipinizu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/jesajugatalefu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9hhaae3ivk87p7t8ofbd55n366/zasan.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/577701934.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2330d768d2---41149359935.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/jesijigug.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea1eabdc3---titilep.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_off00014c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1F 17960 bytes
SHA-256: 40cc0693e7a3fb32defa4d34938b1a7eb1c101251fd69c108988c2da526a03e0
font_01_sfnt_off00017a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19283 10748 bytes
SHA-256: 463ad7a4b9fd569b0ced473592185341ccc03fdb47999077e492bcb6c610cf31

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