Malicious PDF — malware analysis report

Static analysis result for SHA-256 f350c6755265e3fb…

MALICIOUS

PDF

75.6 KB Created: 2021-06-29 23:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d32b3532978f398d200db3533821306 SHA-1: 246448e9460dc881e1d6307e7edd5bd89ad3c564 SHA-256: f350c6755265e3fbbef540667cd9c364b14e65dc5122d916196f49553e0c51ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and an ML classifier, indicating it likely exploits a vulnerability to execute code. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links are indicative of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/berazotowolifufuvipajif.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078664bb8c1e---10080099872.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8e8c832a---97200443008.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02611a0a7---29788104059.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfa56acae---piruwovedeke.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc9e7f725---11697154669.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e677aac0d---zapemado.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e03a5b5513a97138322fe29615215c74/25310341969.pdf
    • http://preserveproperties.com/userfiles/files/sodofebe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b303dab84---86298178849.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1333550f7---detuwetixuf.pdf
    • https://holocaustresearch.pl/nowy/photo/file/90173941433.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d77569ed69e---90902146420.pdf
    • http://iziusb.com/userfiles//file/72472596874.pdf
    • https://anfauglir.com/images/file/24939968252.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3lp8honb32qisupsqguof7lte1/567072859.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/01fffe9feccd2044a34eca77d0da8cd0/75864830505.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4rq8he7pbmp162llajfbeknfc1/gopimawomisimevotubileg.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e0c9ec0a---79804553393.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/06822cbc4f9c1b006dc33324fa6a7d66/terewaduf.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6211bed502---62631578760.pdf
    • http://al-bandak.com/userfiles/file/35637686694.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b58cd83---todofijebofasa.pdf
    • https://pharma-tools.eu/galeria/file/sikexegilinogesave.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=exhumation+meaning+in+english
    • 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_off0000bfbb.bin
175589ba4eaabda1b34e4f6e2ecc6d3e6ae21e3c66f1525b3633f6282322c192		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 17984 bytes
font_01_sfnt_off0000ef36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 16792 bytes
font_02_sfnt_off0001074d.bin
48a11c7926eafe7d4faa6924e14f8c3c74dea2ee8a02ab32c80c12d565759f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 10640 bytes

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