Malicious PDF — malware analysis report

Static analysis result for SHA-256 b595070aecb1de06…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 16:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcd4f9350cb5f39ed07d20bd384cd778 SHA-1: 52d4b1f44f1677b6be5a834834dbef73b0c5e605 SHA-256: b595070aecb1de060e2dbdd540475ac9c218b215c00b1c0cda358584a8634152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=heist+game+friv PDF link annotation
    • https://tatvan.in/userfiles/file/xikowop.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/panojeke.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/genadogujuzewimol.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/45495524536.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/datitozizo.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/nasepukoferufelasa.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pezebavakowawuvapebeken.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/17314860869.pdfIn PDF document text
    • https://ozsahinotocam.com/img/userfiles/file/baferoranesanebu.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/jedulijizitupuf.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///37420357285.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/5b6fb4e0eae6fe192fbdc9a3e93bb3e3/mizenudaxumaz.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/72339385229.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/74673367102.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/xedatozapojuremepivitefe.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/fajukiwaxaganoroxipin.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/darepuxinunuruje.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dck8kk2vg6hm970oi01msddln3/zinodofipasumasu.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/37078805790.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e84067ae---6361212066.pdfIn PDF document text
    • http://runo34.ru/attachments/file/kofopopisevaxiradiwatojad.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/89720162535.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/xubeduzuwibija.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/kolozawemar.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_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 10344 bytes
SHA-256: 20fe4772190be1d9addc2d6184eb3fc3d1ad99e24c31a1c37db9cf7a26da23d0
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16364 bytes
SHA-256: 3f049ae3a93db3a62848ae5d2a82cd9532f97bd45089f530123d86014cb0ebcb
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1