Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea14511b86c8eb5…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 02:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac9bce774fc5c50bf201b1ebfaee171a SHA-1: 573f4da16ec3c5361fcdcb5e84a538b57dd78276 SHA-256: 8ea14511b86c8eb56a65ff008de9d7279db6ae1084dde9d1053663abaf755a38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=the+power+of+your+love+sheet+music+free
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0ae3472f---58231239757.pdf
    • https://ludifrance.fr/userfiles/file/2543712886.pdf
    • https://bioesteticaonline.it/file/mububobiwevukotu.pdf
    • https://callalilyvn.com/upload/files/22897640668.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533028a1bd---74610618616.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/accb597ae1f7bf3f44ec91a10537c9fa/97680142211.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uav5f63bh4e9ap6vuqfvf34llc/fojubopivisuworabomuxeres.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66bca5b911---vonowesub.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088336747e77---kuvaginanajajufegeja.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607acabac913a---butonozofejutorifej.pdf
    • http://movietek.vn/hinh-anh/files/23190615864.pdf
    • https://appfacile.it/file/55581602721.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b5900a029---19962677561.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/513c3585865cc9a535f909c13c8d7d9d/bakodowisujevijuvixis.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160733a68c2e97---dagudovef.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eeaa7b5eec7863570f3788875b16cc99/33738862568.pdf
    • http://sklepjola.pl/userfiles/file/40798019453.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da3ae3934---44238012631.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a8skecofk7baaut0c22mq3biv5/33165357858.pdf
    • https://perfecthospital.org/FCKeditor/file/36318964835.pdf
    • https://nestaerospace.com/uploads/file/natizologadi.pdf
    • https://argumentua.com/i/file/26014758731.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_off0000ea2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 16792 bytes
font_01_sfnt_off0001023d.bin
c8ca7b263b48598b74ec6efd4494ea36d07f7bdd995116dc3ed75a058f0314c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 16888 bytes
font_02_sfnt_off00012e69.bin
10ba9ffd59d574d455bd666e8a341455a65aa334f6da8c409f60210017315639
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 10808 bytes