Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1706268908f7f89…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 11:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 191f498fd3e34b147a890821d4a51b09 SHA-1: 6bcad8032739c62fb449ff6fb06566efb1e4b314 SHA-256: e1706268908f7f89feb551766658dc11760edfff1f50fce7b4e56a8565a9ee2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous unknown URLs, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://frankifoto.com/uploads/pages/files/44191218484.pdf In PDF document text
    • http://pnalog.ru/images/file/segitibateno.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/teduzavikexolemoz.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/lizekeboxe.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/wakapukafusaripifas.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7b07dbc64542c09419f326746120b355/89585275590.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gdbuucftebrrj9bfgonq2cv2g1/pitixekolo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e858c667f1e1dd008f1947215f2a91c8/bataxukuwaxilezoduxoxuzig.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/tipanifajilerutinax.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/34200336208.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614306387e443---sozosunejaruxo.pdfIn PDF document text
    • http://www.bash.cl/media/file/pifugenujonebijutukegik.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/83570357545.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/98312675591.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/7219625894.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/vuxopalamediwo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442e77a999c---15564910742.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc43cf8ff---gutep.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/53058699647.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/gijulajilajilip.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/49049361135.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1540b9595eae9380eb5eb304046434bc/54534266991.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/jojabopigamuvureditad.pdfIn PDF document text
    • http://rsentco.com/upload/file/22688507882.pdfIn PDF document text
    • http://falconltd.pl/cache/file/35742003014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=corvus+redmi+note+9+proPDF 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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 10712 bytes
SHA-256: d366e1a7bf5670f63ed0b35a6030d2efeb3b563911b41806cee6b35f3ed3f051
font_02_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 15976 bytes
SHA-256: 4d43a34b6da4e0ddd33047be6a2b32daa7b92753be60a50c1ee8c2e44e9eccc3