Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ce39c14bf2d9df…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 23:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dada7cc6b794867deb23ef0e5a1251c9 SHA-1: 1f6d5c77535dcb6070cfd8d4cac8405f348d8fcd SHA-256: b0ce39c14bf2d9df86b0288b81f308cedbb8ba6859a2df96624418b8f3186156
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a remote support tool lure and links to compromised CMS uploads. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. While no scripts were directly extracted, the document's structure and embedded URLs suggest it is designed to trick users into downloading a secondary payload, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://opuspointpartner.com/ckfinder/userfiles/files/jizumapawinopoteradurig.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614358ca65e50---wilatawimetagupavuleletak.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/93935534056.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1449eg47cqucd73ism116vfp0/dasetibosavisigaze.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/woxulajovoferaped.pdfIn PDF document text
    • http://sushi-belovo.ru/files/67539969553.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/77615262096.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/bebaxifuzikali.pdfIn PDF document text
    • https://rubfila.in/files/file/sakodofoliv.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/fewororosemanutepopowuwib.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/basumal.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147b4c69ecb3---pivari.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219131845599549.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/41369445094.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/neretiza.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109021403443055.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/bajexujerozujixeroj.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/70330244413.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/81726980790.pdfIn PDF document text
    • https://rinducm1.com/contents/files/laluxemixetomojamap.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac32d87079---63561835217.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wawalaratalapefeditinapo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/polunaki.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/20762215398.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_07_21_01_2250.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jilawukukesarogonelarago.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/74035914548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bahubali+2+telugu+full+movie+downloadPDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 17140 bytes
SHA-256: 36be4ce1c1b63e9824bfcce9217ada72a519b7ad25a6141c1a722aeef6b6983e
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 11100 bytes
SHA-256: 9c39368010cdbc690b156e62dac5b360961fa980909d72b4ca381fec8183e82d
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1