Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bb033124e9bce7…

MALICIOUS

PDF

93.4 KB Created: 2021-09-08 14:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67ed39bedc729ba250448189a6294b4e SHA-1: a298eb859a45bd277f86f953705a381932d391fc SHA-256: d9bb033124e9bce7dc92af5d5713451074245cb90ca4cfa0570c75d3f31dd9a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm that redirects to multiple domains, some of which are hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of numerous external URIs and the overall structure point towards a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a54d0878---56156114218.pdf In PDF document text
    • https://remini.hu/userfiles/file/jifamonejoludelubib.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/volupumad.pdfIn PDF document text
    • http://logicamail.it/draft/media/posivede.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/96130548767.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/98190022362.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/98903920181.pdfIn PDF document text
    • http://grimastone.ru/files/73970270684.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161325c62030d9---7325365046.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/92410918515.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f8fef4ca---19207260996.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/6868982389.pdfIn PDF document text
    • http://runhouchem.com/upload/files/bopajomipeb.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/suwiwemulidodakudu.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/23013319292.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc55b596ac---tefavex.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/38727928710.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/xinevas.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pimivif.pdfIn PDF document text
    • http://prestopc.it/upload/file/17466614109.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/58950332172.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/44773640389.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/wesegelikemetagibixadowix.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/14562845536.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/pezapimejugizapasez.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/76927944888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cold+calling+techniques+that+really+work+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_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 18440 bytes
SHA-256: 8499f98f057cf72b1a2ef2a3d33d6c10b0cb7c21c64f51b85840cdccb12a31b0
font_02_sfnt_off00014cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBC 11468 bytes
SHA-256: 7fdf6ee0bf30e941e6554c59a148dc2ae94c6f82109f8043a115f33605347c54