Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1befeab3173c4d0…

MALICIOUS

PDF

79.9 KB Created: 2021-07-08 09:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aa6fd5be7b3cdb4bc2a0d8f6ae245b9 SHA-1: 916ab9d56532b398be4eec35f1490346186aadee SHA-256: a1befeab3173c4d0b9c26e141ebf969ff270ed62eac5cd1c0c2ef16fda8421c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself suggests it is intended to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/84156879709.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gsfmi6acfvc7hi3hrp01d5jd8a/najora.pdf
    • http://washchienluoc.com/upload/file/supizefekixafexigezu.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16199688193521.pdf
    • http://physocare.com/Images_upload/files/ripuwakugabexag.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30028b108---labefowabujomuremor.pdf
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/47570478824.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ddfe300e9---54572392917.pdf
    • http://phuwangnam.com/user_file/file/bonavivosubemufev.pdf
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/59949510860.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098403b1561b---44510351304.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8dfb335e6---70701183281.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajm73r2qt5vair4dcd359p3hpp/lezexavikedobo.pdf
    • http://mdsalon.ru/img/lib/file/nifagege.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e913974a---totusatakuzuja.pdf
    • http://bigxra.com/uploadfile/file/2021061005513773499.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/l4mad9i3ji51h8fgvhecc1a902/zuxewimigatazabavufo.pdf
    • http://russkiivopros.com/images/FCKeditor/file/86821621812.pdf
    • https://abeess.com/userfiles/file/64559096313.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8aabd15f10b7d6fbc83f1b0b95a0f9f6/90281326191.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/golugomevab.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac9cb51f7---feluwitimutuxikupoj.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/3bad9352369c3a37dbe94a14907b0100/32047769819.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f64bb218---98528088900.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607724c4109c7---42251963142.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=past+simple+and+past+continuous+reading+comprehension
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d624.bin
c3b2363cbf373b8417703be55f45cd5f949d255d1dee8ce409cf4a0180187d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 11060 bytes
font_01_sfnt_off0000ef73.bin
58f8d88158590eaff2533b076e0fb6eb09b2a29bec792036bbc7ef05b25f91c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16496 bytes
font_02_sfnt_off000119ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes