Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d23a6a528301a4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 04:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59a2264d42eb1f34f01ed06951358007 SHA-1: 5db56d33a53d36e2ad1718068a4a01afe8d8981a SHA-256: f7d23a6a528301a4554d3f1d75b46543cbe22138e4ae42d86bb5cc43f924cb96
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7cf4e832---94293588851.pdf In PDF document text
    • http://tarnava.eu/user_images/file/12430639809.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/90174792605.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fba9ed0c220---45744473743.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ssh43ltm5esmahusmp7pgtn632/68302900251.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zajexivojuveki.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-14/20210814100533857675.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/52680610394.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210724_4DA4A527B14D9EB1.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/8562906789.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/91696559614.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/29733404421.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/daxuzime.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/latide.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61140b30e---fenoxepeg.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1c86c5ba---29468432415.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65497a7284---43082722700.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/revifuvinixerawi.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/laniwuwojijij.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/92855446436.pdfIn PDF document text
    • https://suksesunited.com/contents/files/taligumil.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab8214189---53901355838.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/doxubezojisadibubumix.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/56147900361.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/sugabelewulakafodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=administra%C3%A7%C3%A3o+p%C3%BAblica+pdf+estrat%C3%A9gia+concursosPDF 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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 20300 bytes
SHA-256: 25b76efe8a64863b1c66df95135990de323787312e8d286a452546fa372042e9
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 11920 bytes
SHA-256: 95e900b3ed9e9996f29fd08afaea443b03bd363717320b90ac4a0fef7421b76f

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