Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e550b22148e6d1…

MALICIOUS

PDF

79.9 KB Created: 2021-06-27 11:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b332ab1fe6b597b9dcc358df033d4654 SHA-1: 1c7b4ac10a3a191dd58c733382a0ce16c5c7618b SHA-256: f5e550b22148e6d1b6b0aba09493946cc7b58ba8fe252b6bc21772e2ee5bfc65
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a link farm designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4ee98457b5e82c25f8538c0e8fc6818f/jafigijotiri.pdf In PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/44461669454.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc4f1c5d46---98616995665.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5e34cve4a9msvs2r1cbo7kflv4/sotaxuz.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc55e93ef---kakepopimajeba.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d24affd---getojanasasinodibej.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e702cd203cce583f177ff1fb7aad70bd/luxegiwonujuvodanugunix.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/bonimisijotofarepupuke.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6649c67366993635d5080d1b198fd7d0/lotazifa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c52236099fb---givasagarifefimedujone.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780b63097b---fonekesidibobiv.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nujevipofepalu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c921202b9---41781007009.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/63972151991.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7b8acad664b1328aece4a519ace8768f/22010003102.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/60910730911.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/69687362633.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bbb65b62ca7b2a9f3574cf0ccc7e9fa2/18468451909.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160992559b80fb---mudokijizabixuvo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/n3irg8i7h8lvbefue2odt990nu/jefebefevinusukoke.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dacbdba2b1---mudulurosujepexeki.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lovewexok.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ae04db218---67215623753.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/moridopefisusokepobikasog.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a4fe3049---22452702756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+relevance+of+philosophy+to+national+developmentPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 11028 bytes
SHA-256: d63acdc8b2cc96fb37bc35568e5eb5d2d93a1f9ba275646a319292e0ef3d04c5
font_01_sfnt_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 17056 bytes
SHA-256: ab4e5f5404873c782e9cb16306603b4231aebe7595b647e84cd86aaff6ed44f4

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