Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3e1ffc1fde4966…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 19:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c408146f4049c9803c8fbd7e5e948f0 SHA-1: a36ab901f963e1d4422e9f5d49e60aee5cd5f57e SHA-256: 4f3e1ffc1fde4966601ee00a27bd36e944c396174c212af6783e2aa78af49d77
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms, suggesting a link farm designed to lure users to download software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed284c25b0---xudepixefafozufirufojapok.pdf
    • http://unseretochter.com/images/file/lubebugemedujozezuxufenug.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e038db6745---puluvaluzatiwiri.pdf
    • http://goodslib.com/userfiles/files/konorikewozukarumadu.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a87657527145452b617a065cfd2e17ac/20600119886.pdf
    • http://sllight.ru/design/img/upload/file/begitaruvodu.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9vdtobt22hdqit8ki6tqdf8l6/tutebevakuzedotugabufuxe.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/26ac58368694caa48cfa0413bfafd90e/92617674509.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rdogjb02af4nc9jhkovaac36h4/5471969565.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265875e4c8---83884936808.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5273204b51f0a35c8fb3c415971e6be6/12616447363.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/nn2678s1rfl2qnkg24sj6d38ei/rafevipitoritixedin.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/84223ade8518b54b21288d59e12a0a38/34421331193.pdf
    • http://micronforgacsolo.hu/UserFiles/file/lowulo.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batukiladobukarefiduri.pdf
    • http://perfekttorun.pl/pliki/jivifuwuvaxudukupadeda.pdf
    • http://aqbnb.com/uploadfile/file/5305591437.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243f353f25---22246416924.pdf
    • http://ruoumoc.com/upload/files/mexevefopibavajokik.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/18577939426.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vlj8pn1auj1fkmlcak3ke04apg/73148119632.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa2c6cdef---84091056652.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/431e7ef50b043055d6043d4b89724849/95360876491.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=windows+10+pro+download+64+bit+with+crack+full+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 16792 bytes
font_01_sfnt_off000102ab.bin
b7fd0fe6225c867283ca78047c02c6e66b095c64eee2858474a194591d3e8ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 17456 bytes
font_02_sfnt_off00012f0c.bin
ca405eb91e063543921eaa36f7c6ad0ca1b8a7f7b5e25601ffe5b9aceaedc674
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 11616 bytes