Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb5acf86a391aa9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 17:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d945cf37a03eded552f412344abe3103 SHA-1: 63ccb1719a42ae4805b424d4457f196915119b2e SHA-256: cfb5acf86a391aa9eb0778be5244a9715a0dcbe3f2d9fdba2a6a1465ac3adcaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc23216ee---vixixitire.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mq79u5psa3k50ahbmfoc8elo8o/61728161246.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/16d23e77a48af0af9052be0406e1f9c0/tidularulovaxetipapajip.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f013d4a00fee7de2f455a8c800f8576a/negadugukawi.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611da352322f8---tokumifikige.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/68685702444.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kazes.pdf
    • http://a-mega.ua/images/uploads/file/65257309648.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kepuwirob.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c317b98dfd9---xejokewoketidowetorigiji.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2q4di2g553jbjlpif2kdpim50c/94310387833.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/l9n1n8he5pl81jv027mrhk7t22/japuzogazepupufalefopanu.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kb9o1fou61ks8trgqmlln358em/30614946823.pdf
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/838990854.pdf
    • http://zuche0551.com/upload/file/44866557389.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2264b0bd1---23427323971.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/804d7902d36282f3c0f9d61efee876d2/82615516612.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088296ccf213---66546387284.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/53554883504.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/xakemelibujizawasupinusu.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/891782280.pdf
    • https://biodez.lt/i/File/522694204.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b32dcfda---42315064086.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=caa+thomas+cook+claim+form+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_off0000d111.bin
0351dcecc95df863fd0fafa0c06101a4af30503cf124e3c93ce40ccd329fbc55
pdf-font-stream PDF embedded font (sfnt) at offset 0xD111 10772 bytes
font_01_sfnt_off0000e9dd.bin
9d7ce866b012f4178bbb9db3bcdd9ee0105abcef9e2c16b209f5eaa8bb049dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 18060 bytes
font_02_sfnt_off00011842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 16792 bytes