Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a55c2da1554c1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 20:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1eb1f159c8c3c5fb05c067fd82695e9 SHA-1: 0b6f207d1a0353f21faec1f52fbd41fa60bd916b SHA-256: db4a55c2da1554c18242c52b88566fbaa65ca0296f92bfbc674ec520d11a416a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=delete+all+texts+android PDF link annotation
    • http://www.uc-kushiro.net/images/library/File/73860162778.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/tejazufud.pdfIn PDF document text
    • http://gibisch.com/files/files/kukoxijereluveseki.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/pelidegojejilofe.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907065540.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/regojilajiwuz.pdfIn PDF document text
    • https://amgaa.org/temp/files/xisemupadaregewokome.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/mizivujonixewu.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/39373351967.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/52971272665.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/bubizosofukimixonekivijo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ef5e43ce---pigifenofuxakuz.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/xojutapudegumixisugiz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba606d33d5---85034800632.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a73766b0c3726c1b0dc642b058b69c18/nijedake.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/lotojibowapobulevivotepi.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/81890992020.pdfIn PDF document text
    • http://praguetransfer.com/files/file/favemewupomiratobema.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913234715799.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/gutoxafomifidovoba.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/fijexut.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/relalub.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/zaxarabadasomutumas.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/41994138567.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/wubizazabebujiniz.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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 10344 bytes
SHA-256: 78490c24934deb8e8c65355a1736550f814686d804e927c4d0ec90b89df4777c
font_01_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17000 bytes
SHA-256: 5d088e4751823288427bf68f2c0ce70b53a7c67f62099d8aabdce6ef848b63a0

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