Malicious PDF — malware analysis report

Static analysis result for SHA-256 4658a98c55f77fe4…

MALICIOUS

PDF

77.6 KB Created: 2021-10-03 00:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 184fa7cf1da7ba27e23376993e305cf0 SHA-1: 14a8b01ad8cc792542a0b126c0b56cc9ac7c832b SHA-256: 4658a98c55f77fe40c2d21f04a68c500a0506b5477c7856c7907a9611ad9432a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external URIs and links to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous links point towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=physics+practical+class+12+gseb+pdf+download PDF link annotation
    • http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/96065143046.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/79605834907.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631230242_1.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16156f75554b39---98542603999.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/39887723224.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/bavuxovuwuredovumusawoj.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/63694782286.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/26782861633.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/1452701902.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/sasezuwidevutekalumegur.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/35795893014.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471b91f0f9d---79358142407.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/9010979332.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21402603628.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/sebaworeputenesoritur.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/84550360002.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/lirazojajinosarixef.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/90821097870.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/fezefijiwolupikex.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/43082002732.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133fff3bfad5---42166865789.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/6389579467.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/78105989775.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/44a49d01f6a0b6294387899cb738d116/19254147751.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/sedozidekujadi.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_off0000c205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC205 11412 bytes
SHA-256: e211953448dd7ba1ff8212f3cfdc794a2f7bf706ec4b66dd1321893ca427acd6
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 19216 bytes
SHA-256: 2bc27056a17f4a2bff5c3a7c0f8d26833ee37f409e3ed5c56dd9d34b3c220380
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1