Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d7f05cc1fde691…

MALICIOUS

PDF

69.4 KB Created: 2021-09-15 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 126b6ea8fe7a2c37b82f4e3d02f9bf84 SHA-1: a2fec2871cab6c4a8855a427cb450e9587633743 SHA-256: 43d7f05cc1fde69186861b9b5b178d76c16a67641afc60a0c5bc1e71eaf0b381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting sites, disguised as a download for 'among us'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary goal appears to be directing users to potentially malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://vvk-wiedermann.at/userfiles/file/23395601330.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcf06d238---21848342116.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/80989988981.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/dopojivokon.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/fe85f56576cce889c4451040dbdc53ea/zibemimerakaduwuzab.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/fibivukopoxerero.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/nuwitusezoxarig.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/93397198502.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/japatuburewigejebepedas.pdfIn PDF document text
    • http://belovosushi.ru/files/bemumesaf.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/fisalomi.pdfIn PDF document text
    • https://pixel.bg/img/file/legiluvever.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/12243628494.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/vufupisumawidot.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/lakesilowebelirigosixa.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630883656.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/3003324213.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rovegad.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/zosopijivimavuwufiwolaw.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/de0c51acfb5b8acd5a87c39c3683369b/95267999264.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jelujatixap.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003b976541---62989918368.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031644465449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=among+us+download+free+androidPDF 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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 14552 bytes
SHA-256: f3b9f035b4376af1ac74dd56b3a0662c28eb88be218d4b3a665ea0b7a26b231c
font_01_sfnt_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 10764 bytes
SHA-256: dd93951140d2389037dc0b672fb4a44ea079fb41b666c0c8e3406bed4ed0e628
font_02_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1