Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d7722f5b27dfd0…

MALICIOUS

PDF

97.0 KB Created: 2021-08-13 02:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9335a4f4d0bf383b499b10dec7a93b52 SHA-1: eb08edc4d8e6544d5cf4ae75491bac3b13e387df SHA-256: e7d7722f5b27dfd07d7c0c9004fb8862fe2652a79c0901e5e5d419e1f7a57b45
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and the presence of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • 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.
  • 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 http://dbcasagayathottam.org/assets/uploads/cms_images/files/7344526671.pdf In PDF document text
    • https://hasekei.jp/userfiles/file/18285525253.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819cde0d6a9---luwaxitakegofo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6e9953b15584cabc9fa22f68e1d1fcd9/61089163987.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/52937409092.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160797e6c72ca2---tudujipunukaliturenisotim.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mobejumiluvujiki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6367172958---50001193944.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc18c3c9cc---mazonudusuvolesubivixi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/96162748363.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/14751186568.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/gajemegopag.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17550cd92c---40175150969.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608520140a528---64092783103.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608416337d5a8---23995387232.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160849756bff5d---865250989.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b607265e012---fefutobuwetimovo.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/nugozaxatewo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df2d8ee3edb---koremesuduzipobu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/63920d4243b942af52d56431222101af/46689964305.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c7bde16f52d626941176ce1f709dc614/nexakabowatekagu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/fikej.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096772195529---xinugelowijuxitivumivim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+blaze+black+2+egglocke+save+file+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 2564 bytes
SHA-256: baa55c1ef37fcd872f469dcb7057cfc4cc5555a31883184f20e74c3cb34eb4c4
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 11184 bytes
SHA-256: b2f7c07c39b44235c0db91ad6792268ca60800727d4188a1a637ac682d7addf6
font_03_sfnt_off0001444d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444D 18272 bytes
SHA-256: 06384538bd8e6691cf74322026016dc187058790a9a239ea3463afc432236e50

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