Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c1b89a09ffebf1…

MALICIOUS

PDF

89.2 KB Created: 2021-07-21 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7fe4149c3298d5a2b80cdfc891831939 SHA-1: 34f7aeaf839c3810d890bc11edc249f65e5c174a SHA-256: a8c1b89a09ffebf1d55942c7396432ec2f286d0c855864199e7cf5d2373a6876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://atamergranit.com/userfiles/file/65018638099.pdf In PDF document text
    • http://chiengthai.com/file_media/file_image/file/7561882489.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51746610664.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a272ecd910---49129494107.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7996f288a761f69062a61ee38a5e0cce/gobopemobinoxusezin.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1185a59400---rabafodisuful.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/50b6572f3f2e32ec50382c57ec454377/dozoxekapaxelupegir.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/94021496768.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c1eafe22783926a130427873e150a5d6/19415968296.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3221c5545524a1bff16a0f34708be3bc/zuxuxivom.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba1bf1ac7---25528415675.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8db4ljh9rqqi8shfdhd8tp696/xasiz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9jaosllg5rf7a3n2ul4l1dtssk/kemalunumirigozomoridabar.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rasodifu.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/83893504913.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/519133758.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/vigesoropelid.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/95337772281.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/mldp9j65uo79pnp9hdii4u1db7/8936119534.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/90030716160.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2b2f986a42f5655c3f1f973d9848f39b/fotepawozuga.pdfIn PDF document text
    • http://jucal.es/images/file/fuxoxupusagogusop.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/1113750648.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160944d5351a4f---4871110604.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/43095796806.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744353c4dba---liwobugigufebej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=termination+of+tenancy+agreement+templatePDF 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_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10732 bytes
SHA-256: efc8e564f827819a8ec968e6766389c40d3f428c934459faf914db9ba34c416e
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 17000 bytes
SHA-256: b0335e8b9908187585efd785fa5eb4ed93b326cd4a2e121a74e670e919ee0fbc
font_02_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1