Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acd189d048d0cd0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 23:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 336917ff41e7e1f7fb07763fd3c357b3 SHA-1: 5589d29a47d1a8556c08daf234289067f4e1815b SHA-256: 5acd189d048d0cd08325dd72890c73d505a65fd7e7a766d72e47a8adcc495b8e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The structure suggests a link farm designed to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/af789aff65618f426310bed06ea0d4a4/tosimumepozodotoxijojuzu.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/pobibotusamigadupilageg.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36436df15---sipofoworoz.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/23504938527.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/10832941fd1dae3d6624dbd767fea586/fubokorijoxoripugewebut.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a52c61834---58195135459.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1bfb4c2346e941a4826546214bd66d4/70018613797.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210530200656.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/30302320158.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210625031756.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5895d46ec6b39fa4cdcba2741cf3b33e/dejaposamudogakovida.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/karunekixokoga.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c301c09353c---sikijonitazuz.pdfIn PDF document text
    • https://camelcarpet.org/d/files/21274938132.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dfc784499aaa53214c1ceb81b3397b8/97040775050.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/86953642978.pdfIn PDF document text
    • https://harom.ro/files/file/bapukawiwulebimabotinuf.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e89aa8700d3---22267886893.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/56427829576.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/gavoxuv.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de8b099d6a0---funugudotixusuzaga.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/51754131687.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/razodik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=foregoing+meaning+in+englishPDF 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_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 10436 bytes
SHA-256: ee4944228e50928f877788727bf15431b14f7b8dee7cbc03b9f90559792c4b16
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 22184 bytes
SHA-256: 2eb984bab080164bdd18bb01a38c39b8e81c4228f64a4a78ab9a5f93eaa044da
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1