Malicious PDF — malware analysis report

Static analysis result for SHA-256 727e8ce6c566d548…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 14:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7610ff90914f4ae7f992f65bfb5abfd SHA-1: 8e4567078c2abb133e2f547d67a8a0494fb55b46 SHA-256: 727e8ce6c566d548d0e9b5791c7e06cbd377a66ad02a0599543746ec90d7cc3f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of multiple distinct hosts and UTM parameters in the URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=going+to+go+in+spanish
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4663b5cc8---gixixakedizas.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc458bafd8---sanitedagezax.pdf
    • http://tienhasteel.com/app/webroot/upload/files/91622379191.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67f9c6243---zupupi.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b0b2a7f65d0dce849f96f780a0ed146d/nolibunerovolokado.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8aaac226---8134480661.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ab70d69644193df61655ccd0670074d4/pemev.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083325e837af---55056039388.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/egde3sh1du9734tpdqhvarhe65/tozigoxumij.pdf
    • http://www.yoko-ono.be/images/userfiles/file/fopileji.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b940728e4---berusalozivode.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/jokijukusebuxexokejeko.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c8d038df---77659697557.pdf
    • http://dulichgiahy.com/upload/file/sepomizetikonager.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/q73ckk4l9u4tpir3ef05uldaus/77359390850.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6f7a4d04841eb9879e817fb6653f0214/88649178732.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fe64032a---dobenuzenimerivusidixover.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ee780317061b563a49d280c4bbf0ced5/3688373902.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/51vvjq0o7v08l13ua0q0o4mmmv/8527058521.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f656c095c---xuseki.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609243c25fba3---4398325961.pdf
    • http://goldnumber.info/userfiles/file/78451689093.pdf
    • https://marblobaths.com/app/webroot/img/files/nigufuxujitilanazepuxum.pdf
    • http://ksnjl.com/userfiles/files/ganakigajeta.pdf
    • https://komunalno-vrgorac.hr/files/tidoxozu.pdf
    • 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_off0000f5e1.bin
1a28b5370d913f0deb75723386cdfafaa1b7c4cc9e7dc9a48c73198ce74c983d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 18672 bytes
font_01_sfnt_off0001263f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 16792 bytes
font_02_sfnt_off00013e56.bin
3cccbe925b6d8bdf39352e516abdd5df283b5466a542c1d12d39ce68b0545c71
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E56 10292 bytes