Malicious PDF — malware analysis report

Static analysis result for SHA-256 565f3468a0d21680…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 16:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed421a7e741fc782823608f55f373f62 SHA-1: 767a974836b14de0a0a3f321513f82d617308670 SHA-256: 565f3468a0d2168028c3c79fca7eee36dcd26e60c56b030db18e8932cadf1377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://eugensa.lt/app/webroot/uploads/userfiles/files/devanumelaloxu.pdf In PDF document text
    • http://mutamobilya.com/images_upload/files/munobasodu.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/84786071578.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0591f9a4f3e3554187957f3aa78057a7/45877316687.pdfIn PDF document text
    • http://www.toptehnik.si/images/kegadixoxojajijobope.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/92154290181.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bae2d129c40---nefikubababaruletefo.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210831000041.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/87303963038.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zutiwaxalozoxawonele.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609306f4785a4---55281156573.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-17/20210517170630292719.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/6046334973.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8946bdb29---faxapokemoz.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210717_13FC05ACC5A4E66C.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/f14sgnngd9q7e1n0api7pa4cgh/tumipegen.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sesezitasipeturizamesivu.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/29842132842.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/palanobakuvijuzovufemutin.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607995e76bb11---66980416097.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/92709463983.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/zifowevobow.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/guwure.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/69860348663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+improve+your+communication+skills+in+english+pdfPDF 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_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 11516 bytes
SHA-256: 1009ef17fdd1d73097059c4768d494dbac3f5087e7b45ed13a8b679a042c5276
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 18056 bytes
SHA-256: e585bda57adb4fa68fe190a8c383ec0d46e9f4c918ed06025580f32628e36f6d