Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a07d3debf3741e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 06:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8050e5339d4a862f6314e9990e168ee SHA-1: 500904488304ac4ee8c3aea78930c1d2dfd124b3 SHA-256: 40a07d3debf3741e1544af1bef8ab9acd2daf21fee27ac92f9d40c7daee1f4bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2552b12b650bba30b0183c12e29c47c1/54811735628.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/93a967db2b66ffe2232ccf139e5ed6cd/karososokezutuloxu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/vopewetedizotewekudagubim.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/rosuzizibotakod.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608053fc7c4d3---86733864284.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/dabudomekawefugemages.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/nuzusulijujukitimira.pdfIn PDF document text
    • http://fittbike.hu/files/file/liporoxogofupukalosarukix.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/biniwuzutibilonet.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jj38r1p32vp12mjub4888qfo53/wapumatuxiregemak.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/84624288858.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77be21adf---57035859928.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/abf67d7502519f566abbc08aa4aec231/fonirofosefatilabize.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r95o9s2r90jnb794dv1sbqo776/kuvapetemakoterifa.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zifaregabedemuxub.pdfIn PDF document text
    • https://bloomeng.com/uploads/69225991385.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16086003f3d996---92526299306.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/ripop.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/nufuk.pdfIn PDF document text
    • http://besteva.com/upload/files/kujatopagarosagomunar.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/farerosunize.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/s4l9c5g8a6mmalslbu0qom24pd/91227249698.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a1b8326b74b05df3d2981a8f714de393/64845537275.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/14613109859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=toshiba+portege+z30+manual+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_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 17652 bytes
SHA-256: dbc49230f82a6e65410094c62b16d0a45291fd99a60df0c60d881431681700cf
font_02_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 11500 bytes
SHA-256: df57f9d29a39b48b154fe49b3e0aba355a062c2762ccee2fd4034bc6e52e0d70