Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eb70ec45c81b08…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 08:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d6a3e640e80ff6b01acf7027c108406 SHA-1: 110be6b46c51215fed8d735728c97dada75a4e29 SHA-256: c7eb70ec45c81b08aadfb0f8c9ba569e2351556152d5f6f0c74d655d6aba90dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=victimology+theories+and+applications+3rd+edition+pdf+free PDF link annotation
    • http://parvazyab.net/basefile/api203/files/mesasur.pdfIn PDF document text
    • http://airmon.hu/images/files/64459011351.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/78724150882.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/nonaminilezopevixixa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b57aec6de9a---27311488537.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e1995a9f39c170e6698b6ebc7ece5496/86246145178.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/lutapuniba.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/10992545791.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/14740113986.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ccvo6e1q9kj6eti69h14gladd/kifowunebuxiluwogalef.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/mojarovejabotaku.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/dasid.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jomerijosefezajusagori.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/kizowix.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/segamowupisapawev.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/vumoxulo.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///4467063113.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/61060629320.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf979a53501---10834792993.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202161812806895.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/28dbbkf44easirscq0o9lh2kjo/98029041455.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/61375024676.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed9d82f99---nalodiw.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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 11320 bytes
SHA-256: 39820e13941f590cd5e5f7dadb9d0d2752184691caf5b45a84bb6abfb5a4b593
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 17464 bytes
SHA-256: 20d559720979db097441c1c0251cd0c02af98c73f464b74a69750dfc7af762ea
font_02_sfnt_off00011c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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