Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e59f8f4f60fa91…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 00:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e35b926cabda852cfe35ce8f9f2f56ab SHA-1: 320e53ccd160d1b49e4782b39046d7f7bb655521 SHA-256: 57e59f8f4f60fa91dc4d44011d642d87fc482aaf9eb390ddfcddc81a168e54c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://simonide.org/userfiles/file/28857382885.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/aa4cbe6d40f3953c5a12a64a5baa033b/75749988269.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/posorapivupevefelesavu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca85797b8---nenesegedaza.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/mupapo.pdfIn PDF document text
    • https://euchebnici.com/img/file/93630661115.pdfIn PDF document text
    • http://esistore.be/userfiles/file/welufikotejov.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/64693679557.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/juwomujojugawupuxe.pdfIn PDF document text
    • https://tmtteks.com/files/76561554949.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/makapaj.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/sopuni.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8a83b95b---fuvukewajupixoxibokur.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/munatazomexovi.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/22953300145.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewor.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3d9f4ab7f1ff5349fb3c1129fd1a99e0/kuxufumi.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/zenakinijakoxap.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/sirun.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210614055803_gfdhru.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/66039709939.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/494fd3e0531cd445328e5d4c135ea6c0/kawatuje.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab839b32e---kusijigajodiwixevajovovi.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/pafuzevugetif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=billie+holiday+biography+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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 10716 bytes
SHA-256: 5f55f46eb774b5a6feaba73ca2ce3aa3e3229d9e20b79c26ead0308fbc0c6611
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 19076 bytes
SHA-256: f9001c97595370a0c7335f58c687048afe0c6cf9f633520d780b4dc373647450

Open this report in the interactive analyzer, or submit your own file for analysis.