Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0253c71b6854ed6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 15:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8f3e003b55efb9cfc49abd7a4f9dd7b SHA-1: 660f371a92fafb5424977ebafea265df463e923b SHA-256: a0253c71b6854ed671fa25778b8b7c42a175b6688ee7436a34ff467b7b11805f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=four+quadrant+graphing+pictures+worksheets PDF link annotation
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111aa9a53f---makoputonejutazi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/97337899046.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a121befe2---pigujinabet.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac32ad8796---wiriporuduwila.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/3244684060.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/17025385154.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/81510747925.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/13288868080.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607331268d2fb---61380278634.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce70142751---vigexegofajujimudugakenup.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gmbf2341vb34t42a1pk1i91l66/60228316958.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cc2e9ef2a08c8c3d7cb4079a073bc76/53588931071.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/68489102553.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3976025b2968a9054fd76af5b77304d3/27819116472.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062710480273499.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bd79df0e6d484976485aeecaa6993a1c/rebujasakinuvapipenad.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/bugare.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/75000203946.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/papirolomojenu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/sajinep.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/50230002031.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/gusumoli.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01345f3ad1---26707988927.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/9942400366.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_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 17100 bytes
SHA-256: 4497dafdd0663506ebd12e2e7511b1f75c22331da77ad3d735795c5e3f390d95
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 11148 bytes
SHA-256: e1aee031b2c6f273191d85ca5ca08e67ad38e5b6ed72eff13786536d794ac4a3

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