Malicious PDF — malware analysis report

Static analysis result for SHA-256 950123ab2cc17d07…

MALICIOUS

PDF

95.7 KB Created: 2021-09-23 11:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3eb9c2ec4f934056dc92a8faa146b3d1 SHA-1: 78209a5f8ed56baa9b6fbbaeb33053c71aaf7f07 SHA-256: 950123ab2cc17d0745058b21597f864be3b6ea758225f653bc4d4814b32ceeed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role as a lure or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=snapdragon+chip+ranking PDF link annotation
    • https://digireg.at/upload/xujegowuzilepo.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/nakuresewexexogatufogof.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/jajoxoru.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/putexedorasitupepeluzowol.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023d8a3cef---55764519611.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8fbc3903---82196921893.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/76664936893.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mifuvodapeke.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/xotogejejunisamin.pdfIn PDF document text
    • https://chp-travel.ir/data/file/7435670401.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/97617955616.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161381b95f2d3d---25443945073.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/36628906536.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/71715779268.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/zeroxa.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/35210144846.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/wogazalaludufe.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/76622228192.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/luxifix.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rafanugijejosaza.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/91997815718.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/19055248017.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/gigewafizexizixuzaz.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/60384905376.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_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 19080 bytes
SHA-256: d646371217102e6f97b719f6b6cceb6f362923506fbc5104e5d14945c436b56c
font_01_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 10516 bytes
SHA-256: 43fb86def43c94cd6af759b97f0ecad22e84183175cf2a46ee8de56553b5da87
font_02_sfnt_off00015906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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