Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67b280e2a5159d5…

MALICIOUS

PDF

84.7 KB Created: 2021-08-20 18:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8ee18400f917ac1ae91a4465d322dd5 SHA-1: 52c2b80168d02f3edbdd3ed38372367e921b9e5f SHA-256: b67b280e2a5159d5cb4792d9d17d1b55a00cdd60c36cd98bc70ae090d6f3db21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://synerhu.ru/uplcv?utm_term=how+to+download+granny+mod+menu+apk PDF link annotation
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/57686243377.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/dibufawomeriwilaz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/21504767142.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/64449187530.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/6409345857.pdfIn PDF document text
    • https://olterus.info/contents//files/76565909049.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n1ffom3j8oupv93ana9q0qko1q/fekopisowije.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/43406818895.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae8995d40---zusewud.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210608_F76C439DE85E910A.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/15878784667.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/timufivojosejojubig.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4dptc1vrksqbnnbg6pjkkfs627/wotiv.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e22a8a194f2bcf5aa152252d86d2e9f1/jevikafusimudaroxuwi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/mulana.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/651ddpgbfetai6rbfct7usaln9/wirefafofetin.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3mb6gue24595l335r3rpj38ml6/soserafavanutewupu.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buzivase.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a414cacd9f1---zitoperulikerefi.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/tomumaluzewixu.pdfIn PDF document text
    • http://jngf.cn/files/file/rizasejarokexolokela.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984af606a97---lozevarakeganub.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/roxetopigo.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/nanofabaluxaziwi.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f102da4b7---sekunowakupawefevase.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 21380 bytes
SHA-256: d7f53ba82d10a84b7b55087dc7ff5b05ba3a064095f1041934d6e91331884953
font_02_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 10860 bytes
SHA-256: d53b27b70c8ffbdee83b74699e4fba1cd1ae113515cb8ef80ec0a1cd1d79960d