Malicious PDF — malware analysis report

Static analysis result for SHA-256 9479834e2ef8a469…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 07:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d723abb86a4cfe97a0d2e99195c632e2 SHA-1: 22959dcd390b6a9dfa9aadd7d7cbb17ee4fd4ab1 SHA-256: 9479834e2ef8a469ffba4d0b252f0c697830726a4c756a15d418413cfb9563dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely intended to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://knuhpharm.kr/userfiles/file/20210902065945.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828b7e2abf2---36597005029.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/315944704f8dabb52c2f06b2b9821c82/71410760159.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071892157c92---3981242867.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/jaxamu.pdfIn PDF document text
    • http://kaies.net/upfiles/210818194843184785szjxih.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/tazafitujix.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/faninerafedolexejili.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/jutejonede.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/zewad.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/mabinilezudixif.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c8d31947a---bakixitinapowop.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b547d7b7---87709158332.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dugosek.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c3d9e5a6---66708506780.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/losakibavodelugatugeb.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/78588634629.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa99f7fa25---zojenafiseja.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pibovugok.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/ritudurejevulotejujej.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/zapaxet.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ff4fa694d5f3c94fdc390126768f110c/lerajuruxulajediboxajelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=local+anaesthetic+toxicity+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_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 10792 bytes
SHA-256: 0983519a465d2588f95e7066d94d780f436b523d35b4ae83836ce2b2be97f8ca
font_01_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 16492 bytes
SHA-256: 7bc71d7afcf59d495dac58d573d9976010f5ccb651555d6f7d1690087032a039
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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