Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a5114340c876dd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 11:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daa959d4424526e1591661e0abc82d9b SHA-1: 122936df2e80f2bfebb7b88f4bb4d7953e194782 SHA-256: 99a5114340c876dda1244ab78af3ca07b406b38db9a1e2992339abfb0a22ff0a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aexpress.lv/index/images/up/file/91110195733.pdf
    • https://iasvn.org/Images_upload/files/19025827711.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/62098773823.pdf
    • http://sartor.ru/upload/files/59620060231.pdf
    • http://www.jasfec.com/imgs/uploads/gogukuruwejapelalatanawi.pdf
    • https://nurea.se/currency/userfiles/file/55983349476.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/xuzatagirofid.pdf
    • http://bjdfszwy.com/filespath/files/20210924015813.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/91116849659.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed891d1a64---rilinesusim.pdf
    • http://iuoooo.com/filespath/files/20210905183515.pdf
    • https://kar360.com/resimler/files/vukuzumovukabixufogabaw.pdf
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/logafan.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f70895b81---78545125054.pdf
    • https://krossi.ru/images/content/files/fefege.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387465297c5---95503839567.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/6665305362.pdf
    • http://fulns.com/uploadfile/fckedit/file/1632315933KsmM.pdf
    • http://kronospan-mofa.hu/editor_up/35600180291.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6ecf96d---58103353262.pdf
    • http://eclickapps.in/userfiles/files/72870609440.pdf
    • http://insuralead.com/userfiles/file/gimejakoliw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=complete+ielts+audio
    • 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_off0000b132.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
font_01_sfnt_off0000c944.bin
7ef09b71c9122b5616d8b8935c285e1c87a028a4ba24cc0c89e45984ef1a448d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 17556 bytes
font_02_sfnt_off0000f5c2.bin
3bd75a4b52a7ff8ce2e0821239685c28ff4dc4ebd1fc33483e007793909e38a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 10480 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.