Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9300cacb12a37a1…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 00:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1776f98be2b4c3c1325274c6e119d170 SHA-1: 5e5b0ef71e29a766b35278b32ea4bd1fe5c2532b SHA-256: d9300cacb12a37a130af3df859b611c7997490185bbc15815f0e32c2ee8755b6
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=where+to+find+pdf+files+in+iphone
    • https://liniagdanskzydowo.pl/files/59459484961.pdf
    • https://larrialdiak.es/files/galeria/files/83898525773.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcf226b62---18248630109.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dij3i6ht4kqn90ukd4m2icjura/xijozizulegipalowu.pdf
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/xetodexijegolus.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee11cdbff---43638613967.pdf
    • http://purofirstli.net/userfiles/file/8244207938.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e856e6c9bf---53773886050.pdf
    • http://rustproofingottawa.com/userfiles/file/58634545517.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec84ed5787---kiluwi.pdf
    • http://cariboohose.com/userfiles/file/483244750.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/duxuxudam.pdf
    • http://nature-revive.org/files/file/xetosinuwab.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1b87739f8551bb93384d8dd212a7d842/leloromoj.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ppfogmsd3pbl5dthgao0dpk4ki/10779556850.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e03f9b3f5---zimupofuxenuv.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc397e1ce0---45014831328.pdf
    • http://cuatudongsaigon.vn/uploads/files/kiwojaf.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/77a7435c9d731bd2bf0837bb73682c23/84191834037.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/55212b730f1088bae5e36ed11c75d35c/puxexitunafikujax.pdf
    • http://booklandbooks.com/userfiles/file/safafagapezasajajorawen.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68a9ded3a---xarixumitememeteve.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081e3823ca---zawamukasaniwudifowutu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ed72a7b5---52806246226.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_off0000eb11.bin
4a7ff0e2eede1320d2cc644bd038686138a17dabe09ce311a412a97b0a503898
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16984 bytes
font_01_sfnt_off00011744.bin
353f505d7bffb8952bc38cb15757949ecadab56ba945aa2cc65355156ef21fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 10424 bytes
font_02_sfnt_off00012ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16792 bytes