Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa61ca04c561f729…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 02:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00297466b7c48813de71a74890288bd1 SHA-1: 4a9a157d8da1a8ea58cbe98e8be0b597536d2a64 SHA-256: fa61ca04c561f7297a4b1969cf05919fff870bf804d60b9148a1a401c3cd1ac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://krisoc.ru/uplcv?utm_term=difference+between+convulsion+and+epilepsy PDF link annotation
    • https://riwg.in/userfiles/file/38149350518.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/16819133274.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/radij.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/wajugujanev.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/sopoviz.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/56760861444.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/miwor.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/17533881982.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/99566974996.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/wovotamoledaxi.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/59691872852.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/xakinomebusoni.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lugegazagetadejevo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d49e9e8675ef5b863470111d0ce91a96/50026534760.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/xikovaxi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6dvv8e2qdcvlme31b1qpt5qoe2/45884081835.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/vidatowikosisosetepiju.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fe336843e45bc78bbe2ce1ee3ebee088/8632138746.pdfIn PDF document text
    • http://spharma.ua/files/file/sewifajemevefapuripe.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/xulururu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae3e4f2f3e---7233004394.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/47027563433.pdfIn PDF document text
    • http://cpils.com/userfiles/file/9902308514.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/51213316479.pdfIn PDF document text
    • http://falerisztika.hu/tmp/75525280517.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/59153759551.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_off0000b4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B2 15828 bytes
SHA-256: 392fa525d6adca40097b80c013c16b62d9753af9cca973887c46ee2e63c39944
font_01_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 11120 bytes
SHA-256: c5f20fb52e69a85546325f808e9b21a3d6fb6ef997603fb0249974c7928a9f0d