Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f78b0f229b2722b…

MALICIOUS

PDF

79.5 KB Created: 2021-06-25 23:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d471e3fd262936bef6f79690d2ead456 SHA-1: 89d241786d6013fd1dd7d9dbdbb7111d2d5caf2d SHA-256: 4f78b0f229b2722b9a56513d3426b77f68eeeae1a75c111a51f178c750ad0f13
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing pages or download further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608075f889273---35973870745.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee41192f48---zorowinokebaba.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/64118837710.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wifuwesasube.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/64828877790.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5244bf93df1289ac625caf8b831197fc/80654862260.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0a4b09edd372879d8652d0b85b745f0b/reverigirivonogegal.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210603231339_360931603.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cvjnso6jnh41bius3l5h5tot7a/73566783178.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5349c372---60806852530.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/novoboniwi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda862f868---82642628423.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7ac82c51---94413987863.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/47dd27f80989d94ae6f8e890e596883f/26140648809.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/tumit.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf720b2f7---bajexabowinu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608543afab022---kebiraxewofubudulunusoxik.pdfIn PDF document text
    • http://iwishop.hu/file/32472085780.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/43265473343.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b14e3a93120---16845023729.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0b499e0f0a3364e9f1126f2496bd807b/wiwisatewutuno.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/gezikivavevaradut.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7282e24d---41973973073.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/14165491448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+maze+runner+2+full+movie+in+englishPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7263d95930---69236263599.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 10872 bytes
SHA-256: db74b25c7be964deaff5973fc9adacb3d714edf649e089dcf64b22efde506e2f
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 16376 bytes
SHA-256: 8dff335d4c14332ea52b4c16e49a3edee258995983e77b03066c6b161577746e

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