Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34cf71458123b4d…

MALICIOUS

PDF

250.9 KB Created: 2021-06-27 22:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc6e9ab3669304bf5a9d2dde24cd103d SHA-1: 1466bda014d255e0744db64d7c1780e6249962a5 SHA-256: d34cf71458123b4df68ce823a5729e5c0c95a3de1be3a4994bef769b6d5d884e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and multiple heuristics identified external URLs and links to compromised CMS upload storage. The PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a common pattern of luring users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

Heuristics 4

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=foils+in+romeo+and+juliet
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/dc44d3e30d1460e7168d448296a57598/30491958353.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1058cb4a---vataditavixedunirumigitox.pdf
    • http://nakatka.com/files/file/bosovisobo.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1fc5d9c305343cebf4211b49ab49d35b/deweratolifinanefu.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c3ebf0340e4c873028d023d105333682/80427134728.pdf
    • https://belhasasecurity.com/userfiles/file/vaxamuxeminadubariwal.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012ce2d8a6---91124069720.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16208602061483.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc3d01a222---11146692432.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/a03iv8kftbd0i07mba59n8l2j5/15914831801.pdf
    • http://stellamaris.cz/userfiles/56329007993.pdf
    • http://rowanfamilyreunion.com/clients/28915/File/vunatiza.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828c9aa5740---4410354770.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085942c1f714---lutepolosowatiwakijokopi.pdf
    • http://meble-tk.pl/userfiles/file/63004810919.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d60eeb773f---dorobezebojelakagob.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/17036762679.pdf
    • http://alimentosldm.com/userfiles/file/xifaworapawixulal.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/sub8i957pirep36c0ol1rm3ho0/97310720766.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7c1574e2f36ac824fc263e6ec0b61e5a/62735757241.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaf76353b---41257872993.pdf
    • http://standartbio.com/fckfiles/file/65180050980.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f26064ad---binefupibuzaxanukev.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087169747600---dokikofuviref.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_off00038255.bin
a358b9edd0251bf73a2ec2768e1037268ea1ffc55449004668e559c6adc1bc9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x38255 16604 bytes
font_01_sfnt_off0003ad1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3AD1E 16792 bytes
font_02_sfnt_off0003c535.bin
c4204e43818b6ff7ab709fa0e62d3035aac07b1a7f0454774d1e7d223c22a0a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C535 10616 bytes

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