Malicious PDF — malware analysis report

Static analysis result for SHA-256 375c8a38dc163424…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f00cd2cb5e6b3a1b48f06c4bf64caa81 SHA-1: 89082a6e56ca59fba151372a5e3a116ae02f8546 SHA-256: 375c8a38dc16342496396a6c4f9f3259362a52ba0e3f63574256033d1c4aeb93
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external sites hosted on compromised CMS platforms or disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://fd-health.com/upload/ckeditor/files/rakavedeleziv.pdf In PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/6841271668.pdfIn PDF document text
    • http://www.bandungmesin.com/file/darodaxapiwabafes.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/81707083719.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/18513617357.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fcj3r1s943nsk4tn5p7uargaco/55732980225.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nezow.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/38999290530.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/7696565624.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/71703274159.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/luzujuvarogibijem.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/48131593808.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613203f0dcacd---45483264120.pdfIn PDF document text
    • https://camphacement.vn/upload/files/lobiwedideporupo.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/68393946004.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/13244177411.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/wagidalovoviv.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/88160481678.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/55257459436.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69361326037.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/2u4uqkeotd2f7ikptrk30nq821/fidifuzo.pdfIn PDF document text
    • http://ecole.ru/text/images/file/83298733378.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/lubalaregiseju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+virtual+families+2+mod+apkPDF 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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 16304 bytes
SHA-256: e22ac3b89d9faba5546270f0b4566cf53f11ea96e9fb0c906ddf37da86db68e3
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 11124 bytes
SHA-256: e5851d2de30c300515cf0138bc946caa527d46f126af0446dd42b156f2a81a0c
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1