Malicious PDF — malware analysis report

Static analysis result for SHA-256 332881121564c4f7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 18:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e61fdb7cf4416df486d60a24d1103354 SHA-1: e4359efd722a83973e0a956e9cc6885dfad71015 SHA-256: 332881121564c4f79e5013d3fdbb77d6bd6a804ab97d860adfd39c3fc96015b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links aligns with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://svazekobciorlice.cz/userfiles/file/migujurazugexidurozoz.pdf In PDF document text
    • http://school19-zav.ru/userfiles/file/digedurog.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf452c82e3f---54825095754.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5b587f8658490978500c0ea1889b077b/sorusetoka.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zonezuxaseruxiwojeluxa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611db7b072014---52924270427.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/titon.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e323504c---59878170106.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/zomikub.pdfIn PDF document text
    • https://olterus.com/contents//files/87684775391.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/558b9634d6f7b5f80732af82beb1d74a/70954651806.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/10064847249.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd33ad3026---raliditifekoputepojuboxim.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/57753153832.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9afc7627d---pogefevogiposilikamoj.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083292ed502e---53151739448.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620861427.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cc4bc786---91335200315.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/16937157797.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/vumogajatitulusojomiwo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78066df837---bolatexuwetosat.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/vipelevudirifer.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/lgevbh9qd0t9pcd8pl9hf8knh1/64675775517.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/573362b1e247ed887535eebab4d18f48/zigupepamadakajeveroguxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=leishmaniasis+cutanea+pdf+2018PDF link annotation
    • https://doi.org/10.3855/In 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_off0000c4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 11180 bytes
SHA-256: 99e11ecea53d6cb5ebe67d3ba82c0616f66b9e1fd813ac16b0df684599e494fa
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 17128 bytes
SHA-256: f2b4d3c5ec27a53fb6f7d2f2a6ee2a2b050b4e071a09e74414d738a8ac9d4e7d