Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e565b4f48dd6569…

MALICIOUS

PDF

95.3 KB Created: 2021-09-15 13:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a616ea415ed94af37263dad2e22aa3d3 SHA-1: d619b914f035ad9deb0ad1489f8fcb2be5741f14 SHA-256: 3e565b4f48dd656915ad8a16c7e272b496203bbf63c3b6455496bbdff4feaa27
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hst2rt763me7n1ajd13rdnt062/52664233446.pdf In PDF document text
    • https://casaalu.com/luutru/files/talepituzavafejuto.pdfIn PDF document text
    • http://8njl.com/userfiles/files/80036486266.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/98312950420.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/82522531592.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/wutudapegelivugafikupu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fexopamadusawomililusifot.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/17149962425.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/kumapepuwixatawutogova.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9d8a44e1f37cbb80659969bd1e546b24/liruniza.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/vizupesepotamofupivew.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/96510636728.pdfIn PDF document text
    • http://trevorhannant.com/48940115580.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mowutajaj.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210903_7AFF565CAA274F32.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/refuxej.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b9d22dfd---44654339347.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/lozodunebidufapu.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/zumid.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3021894381.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/99583184659.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/60093851729.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/nipasaxixekeru.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109151657253258.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/60361918128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=real+instagram+followers+free+no+human+verificationPDF 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_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 18516 bytes
SHA-256: 7923937da17bd4ebeb0d4cccae1632cdb57a50a3aa20eab32083872827d0b8b2
font_01_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 11080 bytes
SHA-256: c4f7d927733567595687a38be10e17610cb0d6090c187b9dad68e69ef4227f5f
font_02_sfnt_off00015773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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