Malicious PDF — malware analysis report

Static analysis result for SHA-256 0071963c4c0b9191…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 05:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c063f41b87e5ef9e7411eaa0474546b1 SHA-1: 776bfdab1cd5801a6ad83f1bfa5b24167855b259 SHA-256: 0071963c4c0b91913523f0a3aa132852012fd68a1427052de9bb78e1ca665f9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, including a link farm hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://radecznica.pl/userfiles/file/41361755805.pdf In PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/6806996748.pdfIn PDF document text
    • http://labonscafe.com/userfiles/datetemofojawemiso.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/bususexiroguzenek.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/48195611997.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/riburunumulemirim.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zibafamamuraguvolo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2rsu3foq3mdo60fer2sp8emgc7/94819041194.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/43107755804.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/32551996291.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6a5b6dd8---36824450869.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/6334333084.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091903084380554.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/wefipetite.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/33517276775.pdfIn PDF document text
    • http://wernitznigg.at/files/50045161199.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/9667958718.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/331279639.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/zinekovege.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ldgbpioiumvqhdn57t69vuprp/taduridivivipojidofajipo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43e2b3ae---39227961276.pdfIn PDF document text
    • http://grabnerestriche.at/riraribiwogekep.pdfIn PDF document text
    • http://regmac.net/userfiles/files/xodar.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/firasovorojisukametidaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=holt+science+and+technology+life+science+online+textbook+pdfPDF link annotation
    • 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_off0000d580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 11236 bytes
SHA-256: c7eee73e09f37860800fefb8db9e928d3fcf351e924538210dd215920c7689f1
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16784 bytes
SHA-256: 6d0996d0911bdc7f4d2347a8782199a52b36c328f39a8aa6f629d4fb4ff81e3b

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