Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b67bfe73b5df6a1…

MALICIOUS

PDF

92.9 KB Created: 2021-07-03 15:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac26aeaf7f0a9aad61165e403e807919 SHA-1: fdc75305de9bc54a4af5c28519071a6331369428 SHA-256: 0b67bfe73b5df6a14c7f6630e531eb0c8d6f80f6427da668957b648d4c639f26
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f418a4807---nisojupagetiruruxola.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/92111273931.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e63566f6---votat.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7158ae35---76971092471.pdf
    • http://alarcon-v.com/editor_upload_image/file/83466790303.pdf
    • http://adaviestransportltd.com/userfiles/file/50249505485.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e65b02838ad7c1f40a1a362fc04386cc/1200864042.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/708c608efca4aeb35b852500836eb014/badivisapi.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/14f3091789ec724d2bef3aede6c3a840/63308518429.pdf
    • http://domeinbeverdonk.be/assets/files/file/85680231928.pdf
    • http://jyotiacademicpress.org/uploads/file/zewisefi.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607882c89f581---13269274663.pdf
    • http://okwmd.com/upload/fckeditor/file/wegezuvizediretapukuvam.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bf2cf6433ada89f81c5c25055766d34/wigamowesarefokovagenapoj.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/liluwawasagosapimulo.pdf
    • http://prodottoitalia.eu/userfiles/files/kemasenenozuxike.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efad01e15---98841928834.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16088dc108b5e2---wezete.pdf
    • http://augustaelectricalwork.com/editorData/file/41454046002.pdf
    • http://monkey-do.net/userfiles/file/paramiwaviguwujap.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8f5a3080b502ad9492c3b5a429c9aca5/35306248387.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c695c7af---24922459041.pdf
    • http://amadpich.com/userfiles/file/23903822060.pdf
    • https://anandamsanyal.com/userfiles/file/nuwijel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+a+tape+diagram+in+math
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010941.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
font_01_sfnt_off00012153.bin
6f150cf1f56c68a321c2a4a768e8d57665c233674dfa69ff567a676aa04c16c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 17240 bytes
font_02_sfnt_off00014e2e.bin
08f6a3e47073da9a8145e9770fb4a8376eea26b5561ac11c7ee6bb02e837989c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2E 10664 bytes