Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cb7acadfd00ba2…

MALICIOUS

PDF

87.8 KB Created: 2021-10-08 19:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71fd09bb27265f23d01fb9ac7d15b8a6 SHA-1: 2860c627af6c37db2a1bd96105d4f582a7866e85 SHA-256: f9cb7acadfd00ba23cd9ee95d2730d220efcad153724acfd3d32a9d599ff6d44
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple unknown URLs, with at least one hosted on a compromised CMS upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ecf7509508---libipifav.pdf In PDF document text
    • https://panoramabyty.cz/content/14442699519.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/xuxiwezovexenaxafaboze.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/pimabadenurexamek.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210918040124.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/65509648972.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/85824625712.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rvoa7086bjg3curmiepp4utggl/pujesibinap.pdfIn PDF document text
    • http://em-ail.ch/pictures/2/10065718614.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/dizovaxuwudazudamamive.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/57368911687.pdfIn PDF document text
    • http://gysanya.com/upload/file/210924031856657843mn3sbipbryau.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/pidirolega.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/popuvudenun.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/85461020308.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/tenamonarolivivax.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/28335669389.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/povitedovelanukeb.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97947104834.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zejuxug.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a02d1f5e4f229a253041532fb87a8b57/15526617875.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16150ff9e6cb4a---litufapikigolumazek.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/tugilobipofavorivegutibe.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/62793757802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=low+bun+and+creatinine+meaningPDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 19772 bytes
SHA-256: cd3f60c18b6699d1ceedad62c1c481722a25edac93b477a81b9f98661fe49133
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 10780 bytes
SHA-256: f60c0edd87b7b499c1bb8eb8cc8accebbc598b319d206f9fa8ffa9407a8b7aac
font_02_sfnt_off00013939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1