Malicious PDF — malware analysis report

Static analysis result for SHA-256 4185d44b762b6f88…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 09:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5170ba5ded461b4751af17c27e32e3b4 SHA-1: 4d744e0acfec2777d101f1597f9d07f0101e0bbb SHA-256: 4185d44b762b6f88056f3c069097559d917ed64f7ac6d7e27694adb057341580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5674a9a0---85230050150.pdf In PDF document text
    • http://selfmadefilms.nl/userfiles/files/78084045830.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e753e6fa---64841906548.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84866fd1c---mumetuwopaxopigotopiba.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/53683426134.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6af9qv83t5qprsu75st9i7hu62/66635625323.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/safuzedamamilanelodozokud.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/35171319141.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/madenasunuxupug.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee684f511---fazutikiz.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7c35b7e445f2d3ddbfd0a91ce40e7878/betizedelix.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/97489228070.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/nuronogaj.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/79360543785.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71136611448.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cgftiltms8t4upjiu93gqlsgi4/3902558096.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5c1bfd5b---wamemesumegitiwunuvemo.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/tozom.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fb400b95---61416559573.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/472de16dc4ec7542b215b45ec50c5899/42827987022.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0eb19176---suzidewiwug.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/08abaff10799b958a82def4fe4c06d1b/32822981099.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/vixukovutugekazinape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+pray+to+maryPDF 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_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10060 bytes
SHA-256: 8aee98c0c6ce8ecba8129747c77b3b47ee03fb13a9f858a167a1aee5af570f8f
font_01_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 17660 bytes
SHA-256: fb48ad451fd0926bdb948becde6beef26444009575fefc9b3910651c4e76d03e

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