Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86c88479e7e7c3b…

MALICIOUS

PDF

83.3 KB Created: 2021-07-21 04:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ee526eaca3988d52f661550ce4471c0 SHA-1: 1c1ddc5dc49a4e90b67ddc718ec4c83df583588e SHA-256: c86c88479e7e7c3bdbb5e81d94e8ea5b5131862b4ca134e16a8c2f239bab7111
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The heuristics indicate the PDF acts as a link farm pointing to compromised WordPress sites, likely to host malicious payloads or phishing content. ClamAV detection and ML classification strongly suggest malicious intent, with the embedded JavaScript likely responsible for redirecting the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56df79550---tepesuxujexi.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b8m9ueqfntjv0r00b0umktevl2/92285760274.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/13362930755.pdfIn PDF document text
    • http://consade.com/userfiles/file/tilelu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b11940e4---murigisotajot.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bdd29d662c1---666626591.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/498fd3158ac2924b9fd9acb0880ef643/nojepiwuxisori.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/91177674998.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00334f6917881b7c6054e9921e6001d6/76603435805.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd537535015---berilozope.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/e9k5l6gjj4i55n1qniqeng5kh6/65557609481.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/12871552571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb5b8c017a---59483519743.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/60542029311.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8371a05db78379294f9558b2fa54ceaf/famumalobufile.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61806d9c5---5069636770.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9205755185---pipikokoxiwor.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/koxixulij.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/69679030150.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/45766130121.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc59e030e5---36513027020.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/edeb2fbd85d32b62e08d5a79069cf5e7/57171139547.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/turovidorimadonetiboko.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/5687894323.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jixozusudutuluvibejunum.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/50257106036.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kujupatenelofutumizonen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+save+word+2007+document+as+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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 11176 bytes
SHA-256: e597c4a1bc4bff1617a40ac997189ed4d11fb38c4c431394f56179b702555b79
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 16496 bytes
SHA-256: e02faf8b00baf2816067e77b5599901da65d0c6f24e3c5a9c39510c5ed8cf15b
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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