Malicious PDF — malware analysis report

Static analysis result for SHA-256 362f90746ebe10c4…

MALICIOUS

PDF

91.3 KB Created: 2021-07-24 07:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 584e3d73b57813b6225e26ec372a633b SHA-1: 1ed59e4b7ee98dff0fd0c6e8992db1cbfcf8e7a5 SHA-256: 362f90746ebe10c492c2d3f9b1a29f6dae787d8ff263167408c859ddd855b787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into clicking through to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e03e5776---87980786737.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f612b9a8b1---bonuj.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/52454726759.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/dozuzemenilibejevuwe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7bd8a276f---gudoz.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/pomegaperezutitumine.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/gukeveverarikaximedezumo.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c0e504d78feda5544957519e22ca218b/rawugafilepezevizefuz.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vinotidagoxuselotomuridix.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160765db1614d4---96011494189.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/29516766454.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/95140936002.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32dbb4cee---75645856183.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210612075116.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092522d9095c---lonepafubuzewozesi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/93414977963.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d74e1bc4---rulupesu.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/leterefifo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69a46c666---56483772141.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/43957989dc17c6518470f1f95d521dc8/58762728996.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160752625bd121---garizosudadakefabotipul.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e407cd05e8---44541337415.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/jejojekobaketiko.pdfIn PDF document text
    • http://fittbikese.hu/files/file/44527147246.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d353ef0e8a---25212779028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=livre+de+mariama+ba+une+si+longue+lettre+pdfPDF 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_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 11104 bytes
SHA-256: 44bfee7a75213d705cdc646b00a13134eb1544bbe00701565262b26ba6e7f22d
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 19012 bytes
SHA-256: 2a99caa4c9768815c224dfe933d9b1377bc9836d3585e4a3c1df0a583085a559
font_02_sfnt_off00014605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1