Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc5b311c908e422…

MALICIOUS

PDF

69.1 KB Created: 2021-09-17 11:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9bffc987acc3f119fbc32ca0455f4a4 SHA-1: 414e5933bb68d06a64955fda95c8085e4f29287e SHA-256: ffc5b311c908e4227bbbfb1bd5aa6f6059383aa0c1669047f9f21b054889518c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, potentially leading to further malicious content or phishing attempts. The 'SE_CALLBACK_LURE' heuristic specifically suggests the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b373252ba3---26998718500.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/wudikozewogo.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/jibifabuxaxeruvanak.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/47317952980.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9uh3md9664jsao1918p19cc06d/bajoxerolu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11014fe56---44403298605.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140f37c5936b---rikup.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/62339888818.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/69971466346.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/58989664795.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/76341041597.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gasurinisej.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/38334938024.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57dd85a60f4d172cdf3514faba43d50e/59315934212.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a315d9bc---kodatipudotigazegagavi.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/kojenokesusitabuse.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/rurijaxupejokisamedizul.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/1368359088.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/34247671950.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/58690549937.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/36263010935.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210914_8E4C9D8E3ABF0517.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/33182472834.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/82106995218.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dolobesotugotuture.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+clean+launcher+for+androidPDF 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_off0000b25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25C 14404 bytes
SHA-256: 4fd50c723bc1cff632376e32e89f84459a25efea3659b940807fdaec7378c99a
font_01_sfnt_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 10724 bytes
SHA-256: 9fc1fa11940939a4888b995907f36038971bb1fbf8511d36471041dce0773f3a