Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1a984f681f9930…

MALICIOUS

PDF

75.3 KB Created: 2021-06-26 00:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c79c4a70a7fe74a4d9c2d03eb8ad187d SHA-1: 5f06a45c99127248ebe27e32c3ff76f0464de32c SHA-256: ce1a984f681f99304ca87376c370e858513a88cc0d599a1ca3ee9f8d1fd44da3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links, many pointing to WordPress sites with form upload plugins, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077988c8153d---84065395344.pdf
    • http://hanasushimenifee.com/uploads/files/komaladadige.pdf
    • http://adveotec.com/img/file/mezib.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/d55398a510bdc8d5eaac732a91f34200/paxujogidafuja.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/29cf1544968976abb32c87f04be6c366/xabubikajuvaroji.pdf
    • http://alpha-cp.com/userfiles/file/supusebepezopazobujunedo.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b145fbc064c---76506727136.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab8d47a69---78792401920.pdf
    • https://autotrans911.com/thread/admin/uploads/file/gagerawisofuxujoveraze.pdf
    • http://jfhconsultancy.nl/userfiles/files/50467110560.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609707c9d197e---bixowotemol.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802bd2b50c6---wevejesepi.pdf
    • http://france-ex.com/images/blog//file/saxadulixezap.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7fb11457---34412735451.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f21059f3cc2fb72f0dc09b61652eb242/21194141754.pdf
    • http://dorp.pl/userfiles/files/siweb.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af1520736fc---21673293977.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2affa3b951---67618449343.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540bbb2763---48204537766.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/qonrmnnvgigbj8s1n02g1cbten/wazirebolesumajuzode.pdf
    • http://ibshop.gr/uploads/_uploads/files/59395321375.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6f1433f518cd7193e6a69ffb4bf39d3e/wigifa.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b218e58fd0c---89013319748.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/e344391d9006fd115eebb6998cee5592/guvavijeduxexomawabutul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=yeast+extract+glucose+chloramphenicol+agar
    • 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_off0000c05b.bin
77a08c78742317899895aff43b8351cb9d4aa982aa5d9197add3b2034f9801ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 16916 bytes
font_01_sfnt_off0000ec46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16792 bytes
font_02_sfnt_off0001045d.bin
b637b6dff02e56908d4aed37f6d8cefffdeaf655d12906ea8cf1a710398724ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 11004 bytes

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