Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aace668fb03a474…

MALICIOUS

PDF

73.7 KB Created: 2021-06-26 07:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1040b7f5f23a1e2b3c145a9c13ddca59 SHA-1: 5948be80988d1fc293de02bb4b7e7abf248ac02a SHA-256: 5aace668fb03a47442c9d51bdb94c061aaf3944e89ac35146666c046610a4485
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns suggest it's designed to lure users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1b6401381744a1f8b1f5e3c4a3566717/tenufutuzumoxokar.pdf
    • http://agcslohian.com/userfiles/file/67662207750.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8859bef4e0---85423696011.pdf
    • http://kleiberit.ru/files/file/91940272491.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/gtvtd2ea0ln7ur897odoeri610/tumamikapajasuxone.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc58eefcf---jafojujodifagojem.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d1f254280---39908881050.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9719acd07---wimomogolorasikebakeril.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa819aafb08---26885085012.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/vksavjlkp6nl9tncik79tb3838/jopolanurolu.pdf
    • http://xboxheerlen.nl/userfiles/file/91295523595.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4aa6d71b0d56521b3dc25f8a9fc099eb/68216028469.pdf
    • https://area5srl.it/file/54755509880.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722891e86eb---ruwitevizulemixuxodinimon.pdf
    • https://led7.ru/file/zuxoketokupotajetaga.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e9e0848c---wugananefenowe.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67e403a612---13997744200.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1tisnje9d9eklnv20r20qb4j0/71670048992.pdf
    • http://security-m.jp/tool/images/file/26334146317.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4052af49f0d37f27670ee95d1455e795/96696922851.pdf
    • http://shuimotongyuan.com/userfiles/file/tagapizasakif.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e509bcb31---xixom.pdf
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/xolerozonezipomomejebek.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddde5e601---44416398958.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=everyday+english+grammar+and+composition+class+8+solutions+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_off0000be6f.bin
e5759fdaadf96904a7ae8e12212ce92eb29b55640e46c7a6afd679113cf5c6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 11536 bytes
font_01_sfnt_off0000d969.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 16792 bytes
font_02_sfnt_off0000f17b.bin
d51c7b48aaed2fcf586e03bbece806cd010cf710efd5dfd1ffaffefba80bbd89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 15484 bytes

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