Malicious PDF — malware analysis report

Static analysis result for SHA-256 0916fb42336fc104…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 03:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d14a717da8f42a2bb1b6b800e5a437c SHA-1: 84373c52a092e237e69b0aafea1b9e371dac7c6f SHA-256: 0916fb42336fc1045ba7b1a9f628a789bc79284a7f82562b0e9d896722d0ce61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection indicate a high likelihood of malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=gta+5+apk+pc
    • http://baggiez.net/userfiles/file/bojiruvirematapedilarozen.pdf
    • http://gbfrjournal.org/pds/userfiles/files/xeripal.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140822139720---vupanunibimeduvijar.pdf
    • https://benmoonpharma.com/userfiles/file/xixiwig.pdf
    • https://happy-playground.gr/uploads/_uploads/files/saxisetepibogubub.pdf
    • http://sm300159.agchost.com/userfiles/files/12733811959.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sqfs57ficjerqv5h5mn5mrhg2b/21623187120.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130042f05ea8---14463811114.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd03ed730---notekela.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/sidikozirerotekafub.pdf
    • http://www.bufolari.com/public/immagini/file/memuporilirikaseguza.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/75458919072.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/58043408440.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f5b1a67e3ca9d776d08d31fe4384526f/jebugamekurugekikagir.pdf
    • https://chuyennhakienvangvn.net/upload/files/78748790802.pdf
    • https://cupanghitam.com/contents/files/11619062492.pdf
    • http://jfhconsultancy.nl/userfiles/files/34361829861.pdf
    • http://scbczy.cn/up_files/file/20210912_025858.pdf
    • http://auksozvynas.lt/userfiles/file/xusisimisoti.pdf
    • http://zzps.pl/userfiles/file/47651295675.pdf
    • http://officinedesign.it/userfiles/files/24312153888.pdf
    • https://karlholmbygg.se/UserFiles/files/86406449618.pdf
    • http://manpukulivermore.com/uploads/files/41268991611.pdf
    • http://sk-uralstroy.ru/uploads/files/36504701225.pdf
    • http://matras-devison.ru/upload/file/80843959814.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_off0000dd21.bin
4f63a1e3039d9a332eba6ed5a19b1efd8b3be18d69665b00c9fabbf95fd66d62
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 17928 bytes
font_01_sfnt_off00010b93.bin
0e97cb26ca6ef45b64e487cac4c8544d4c52641444ad38329931d73cb9bbea8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 9868 bytes
font_02_sfnt_off0001218a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 16792 bytes