Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff1deff4d97e174…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 15:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eef1abac2ad864bd7b1a8c247b44667b SHA-1: 7f4e874592449f4e40c8e53565533019dbc045ce SHA-256: fff1deff4d97e174fae44b29f3a4723d4f57e10a83312c160304e083f663f1c1
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 domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lprve528tjeedgq0qbrslkqtvr/72315827265.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/79200436280.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210714050353.pdfIn PDF document text
    • http://cocoal.com/uploads/file/durokaxudotejofesapi.pdfIn PDF document text
    • https://bloc-immo.com/images/27857020820.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb5896d86---62377007819.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/9101930372.pdfIn PDF document text
    • http://healthywithhart.com/res/file/rederupug.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae5de8a49---37970837689.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a95921e297c---fagunofidilivoz.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/sixewi.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/89350398425.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/zajit.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kisasozaleju.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0244853001629421527.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3c25e5cf---woturowakalimoguw.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/65983539519.pdfIn PDF document text
    • http://geodez.com/pliki/file/nesoragupij.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/muwujufodomidon.pdfIn PDF document text
    • http://nemochem.cn/upload/files/pununiwok.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31a0b75b3---85579085847.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6nb4q4d2lc957aj2ven1nfe71s/bemidulabukuwadimovixit.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160acd19d168e2---22397471783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=asset+management+industry+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/93270435546.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10868 bytes
SHA-256: 1fdd387741c7680313886386af7c11725f9a8083e5f9d35a9b994682b6b9155e
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 18552 bytes
SHA-256: 574a03226a7985543b150cb41925515d7d4b2e47473142dd8dec2aad28d6cfe4

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