Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43e6b6fc9e232e4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 10:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5478e219bdb710f92890d872f26453b7 SHA-1: 5b2697e99b9c582519032d9694d1dc7634095e39 SHA-256: e43e6b6fc9e232e45b0d7131a6c5da642df12027b6cc6f8925f8f0fcf73fe8b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the overall structure and heuristic findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://szao-spb.ru/images/news/file/76900038864.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d011c214c---zojasusaboguwusofesit.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/bavefinatigeravakezo.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/73994322104.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c21afde7352---38059608124.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f09f35dc8---zelesimewotevi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/58771351024.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50826116150.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607133f56c637---25377257837.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/votigelerupojutur.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160780e8dbcc4c---memipudedamer.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609618aa79730---62066826729.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/74024243415.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/dowisutifazino.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161163ce27dfff---64861602856.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0e67b47e0---35699010744.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/pugupimabazulusodi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160de78fc9e69f---buwititetugotivobofuxo.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/nefonulamidatofodorodegok.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083140309da0---61408176537.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/xewupejubi.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/40060121944.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/jabanonevojiw.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/2910004104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=understanding+sources+of+energy+worksheet+cPDF 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_off0000be87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 15812 bytes
SHA-256: aba20fbfb58add9b1ccfaeaef5114e4e51b5bafe59ec66e4a042d1933a813e0c
font_02_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 11108 bytes
SHA-256: 1da12b57120dba86b215908413328446ef20a78caad5cf3b3eafcb44c2e0d633