Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9156cc4cf3441a3…

MALICIOUS

PDF

105.5 KB Created: 2021-09-05 19:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 277d764cea96cff97966aa99593b394f SHA-1: 1532fc4091d6973f65e057611b2a55846fc80cae SHA-256: c9156cc4cf3441a31db8d27d603b1cc0345bdf4ac0008dd7196e268ede6c824b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. The PDF contains a large number of external links, many pointing to compromised or disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://hiroi-es.info/yamituki-n/uploads/files/duxababofot.pdf In PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/mifemawe.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/dajedoxejo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bojusikupomo.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210722082441.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f7c56ef62c---72435391727.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/pakolitakawekepono.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/15492088504.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/65973553967.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lulereruga.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/39412321941.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c71a3af79506ff7320ac4ead1ef9326d/gaguri.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/39904591333.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazin.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nujrq530om6sbu1dqf6e67l803/27689416022.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/194538712960f96c7ac583d.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/9079399182.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/86467261257.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/pisugalixasimudakap.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a2f064c5---vofunorenujevilamu.pdfIn PDF document text
    • http://ledson.ru/upload_picture/vegudededoti.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/rinanekabipon.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160832d4ef1fbc---38645366154.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a77510bd---ponudov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=history+of+islamic+philosophy+henry+corbin+pdfPDF 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_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 11132 bytes
SHA-256: fcb886cddde6fe6a7ab9a6a64493e308eb6032e3843cfb034135891d1064be68
font_01_sfnt_off000142f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F4 23768 bytes
SHA-256: 3cddac25e1c3cf3e1ac6f9e85055d80eff00eb78b08ecbb15eaf637ec1d1c384
font_02_sfnt_off00017f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.