Malicious PDF — malware analysis report

Static analysis result for SHA-256 010f55d1cab636a8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 08:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5def507be3bc9fe161a51f53978ab24 SHA-1: 9e8eac28b61f202a6b6b6d6077c5018e60c4652a SHA-256: 010f55d1cab636a82f406247e7505707c3b80c1d9ac5583dd187f2da9c663a9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://travelworld.ro/userfiles/file/xukunew.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9b184f17---temewomebasisorubokowixup.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614061c9d6065---1170706708.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nesajutamuvaz.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xokosejegidagedugeso.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zupenejuka.pdfIn PDF document text
    • https://digiconelectronics.com/media/35258291951.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613745e4a78fd---sesevibikotufalaziweb.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/fujivugesi.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sexidurizero.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210918file///32731429788.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/18636613489.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/nibutevajobobefa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614033f7459a8---tusuliloridupeturin.pdfIn PDF document text
    • https://kuepancong.com/contents/files/21866934343.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2b3c6c0db08dfb78e99216eca5ac8032/dulopanizuxiwapakubatat.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/95725438019.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/xatatomoporaje.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/dipofapokuketizamavevadav.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210924_171116.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/85291575386.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/64907257055.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_09317E1C3EFDB6A8.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vetifogose.pdfIn PDF document text
    • http://ciskmv.com/css/file/rawapovuxexogovuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+vs+iphonePDF 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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 10228 bytes
SHA-256: 4cd09ad1f8693b88aea166ce5007d8e5ba92a0bc66fcf94fdd901360ed97876d
font_01_sfnt_off0000ca96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 14960 bytes
SHA-256: 5601c3ab23c992409c90d75bd53caf0f72029cb79baed3daa9f33a5690a1f895

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