Malicious PDF — malware analysis report

Static analysis result for SHA-256 add102c24f2a9804…

MALICIOUS

PDF

118.9 KB Created: 2021-08-13 21:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8eded381b9e8c5e3a16ed37cf19b920f SHA-1: 21ff493f16cb12ffe2e559fa3639200d0542dfec SHA-256: add102c24f2a98049364154e8984cac72e24d53a44c0bc6c47fdc547ed96e768
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The primary attack pattern involves luring users through a malicious attachment to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/331fbb6158e48f12bc8ac5baf35f02ff/24765617652.pdf In PDF document text
    • http://mobilenmr.com/files/files/13339533547.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/38198282915.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/df89232f4d8bf6b06e894531881693b0/dejurugidebojo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/0o0ldd600eotq2f2vnvne9btl0/sidekaduxixatabobaxulo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9dfed014c---mavoduk.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160813a6201826---39306587007.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/6581997290.pdfIn PDF document text
    • http://shosholoza.de/file/67944434726.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jqs7t4koj9frlraov333k3sb14/sepiponolezajetuzidup.pdfIn PDF document text
    • https://digireg.org/upload/83212702792.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/60277199459.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b558e894892---xagegiru.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/43630430687.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/j53qhg22r26vh8jjv6q9fk0obe/48514368264.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/rutufegugu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/fetimuxenugi.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/13435134646.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/febajojuke.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34c2b559---damirenelifunakivitu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a647e922d---78347454043.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/solivozawojunoli.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ee8623db---xakox.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/urpuvhro96jbpcgucmar10cg2q/kipomenepukabomugesalof.pdfIn PDF document text
    • https://go2germany.ru/files/file/69974725536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+hells+angels+logoPDF 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_off000170d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D6 17484 bytes
SHA-256: 9798cce0289e3c0b858b722b21ac27a7f716230d81f0d7af0bd1af9a83a952de
font_01_sfnt_off00019eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6CA 10280 bytes
SHA-256: d4fa8f732c6c18fd099e355ed9d66932ca6ef8ab7e1c96f1a74b677f4dac41a2