Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63c0100aa796132…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 11:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 744261a692fd51a109b964a62024e578 SHA-1: 0946a92d2420a94484c3e8ddfebf7d0b62041183 SHA-256: c63c0100aa796132a49327c2048b6bbd5bf1fd6cfe57a89da7ca0ecb8760eb6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://phayaotechno.com/UserFiles/File/33580114293.pdf In PDF document text
    • http://brainbond.ro/userfiles/file/vazeromibumod.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/18260533872.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/fekupiju.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/bemoseg.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/dazexeginewixeto.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/tavatifozax.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/71183435983.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/xoligegisivixibufasalup.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/40998558394.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc83e032e---51512371944.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021092512534075295.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wodulejerisudaga.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/remetozovopurif.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vesaderuwapojotini.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/52035523200.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/xodopisafuwo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1dad76c3---78949671637.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613248171df67---96132516379.pdfIn PDF document text
    • http://wmsone.com/eimages/file/nujoxubinonawomab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=google+camera+apk+redmi+note+9PDF 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 17216 bytes
SHA-256: 7c4bce83b5a498d02f370ea7b787a3eb5fca03432107524ba634c9b5f5611777
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10988 bytes
SHA-256: 0543219f8b1c9b574e3bdf15717bc991d4acd120186c994bbb0873a3ea7f06ee