Malicious PDF — malware analysis report

Static analysis result for SHA-256 9107c19a0d85ef23…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 10:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae2125c80ddf4ac9e1c36f03649ad74a SHA-1: e7c846748a15a5775fd1b57e617012078bdfbebb SHA-256: 9107c19a0d85ef23ff76acf47b9c1dfa41f9c30f6866206a0b6642796521868d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. It also features a link farm pointing to compromised WordPress sites, indicating an attempt to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4984e47932---mubizekenawiguza.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a2f6112c7---58600835127.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/45093879969.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/78stmr5osnpn46sm4roc5rgtpr/jajujiwoferidurixu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8c59174d---tiwugufodawomeladena.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d11cd4d9---37603383055.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l7rhpdvkqr4c80ebtljor057p7/73292216496.pdf
    • http://garageanything.com/js/upload/files/lufudejixapagulozeb.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/xijumigeriseraluxofaja.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/36525230585.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6913f00---nejowosomepalabatobulizul.pdf
    • http://atomleasing.ru/media/File/5285534693.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3m2ono8i0p77lmrg8p2281t417/36049765680.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f345dc23e0---37521185347.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ff4313ba3549607d9f2296972a6dab9b/19109355575.pdf
    • http://fandimnarodaku.cz/upload/file/19595883729.pdf
    • http://hanasushipickup.com/uploads/files/71439183925.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/423ss0kvdtf8a6cq1phcf98i6d/72593930461.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vq8snn7765dbvk4rmvtinqscvt/25834067152.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b822d5055a9b5f3849abfd69418c2c35/bodotawimag.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i4u33l9i1j31uc30c60ntb47h5/81864540426.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1347c3e306f4544f9d95993500127a76/zikawuzoxofokatifutij.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4391ec2fb---552565973.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3df494bdf52c84e6ff5cd8170d68d29a/rifabagipoxanawugi.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608850d336c64---25074161727.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wind+energy+project
    • 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_off0000f9f4.bin
083a423db833b848cb96776eb2ed6b6c657f1b28e582622105fd0f9cb629e06a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10548 bytes
font_01_sfnt_off000111d4.bin
68918b9b26e925358593f5f0df3f87f42c92f934dbf8e416388b2b25035886bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 18424 bytes
font_02_sfnt_off000141c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 16792 bytes