Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9fe77dd4c36369…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 14:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 623b207e8ca2fb6d6458f755bd80ce3b SHA-1: 5e6d95022275f007f2d354c0829e7618ef4e30c8 SHA-256: 0f9fe77dd4c36369c83cbb9725d0c4647fcb7028b9fe1e7f23fd39bc9cf80e68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=watch+together+on+messenger PDF link annotation
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424e92a5f36---dawemidumoxotasinevomuz.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/96476291773.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090706495751.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/fefavad.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/zipunomimedojuxujefalabix.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/birosijevikepuki.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jimejisutaduveza.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5d454994d512ef174ec3aa9b636190ea/tuzumamizesiwizes.pdfIn PDF document text
    • https://mihalex.by/files/files/madutijimufomajadab.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/12677043781.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/jotepisozifafoforofokux.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165ebac8e3---neforate.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/gexenisezikivulerifafi.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/85287731276.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/73253373950.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/70384865037.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/36051766657.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/19707747808.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/bovibaposigujepalugikumuf.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/7792514079.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/55279594541.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/wirubed.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/20361829461.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/16952812144.pdfIn PDF document text
    • 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_off0000cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 10532 bytes
SHA-256: ef56842ff64ecbd074993527acac7d86242c806feaaccdff6f29d26641f5b0dc
font_02_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 17996 bytes
SHA-256: ae136f6e78b8368c741268e2c42b6fad738897792ac5c33e4777d8cde27f9db8