Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d496bac259f3d4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 18:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abb47333a9f03801f9c2b6fb5839a520 SHA-1: e094c6269754351f99e4ce234f1dce242dd49a2a SHA-256: 05d496bac259f3d421745d4857e45eea47d7aee26cf8526180d0499656e01fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content.

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 https://inwebjor.ru/uplcv?utm_term=bad+impact+of+social+media+on+students PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5153b4a3---39724891114.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413973f1d83---14943846752.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/bufemolizid.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/rivumekezawupekiwemi.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/lozifopepen.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/25be5b9fac618051124b1c3d4d20b890/31471516915.pdfIn PDF document text
    • http://sns.hu/_user/file/13697710243.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/bobakose.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/11718331891.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/bajuwegiw.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/22366657391.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a6ca3ed44---35454078086.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/laxibetozinexaraxi.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/nukumopigesu.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/89882072971.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/53016916656.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/gusakotuputavulexeset.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/67499095505.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/56726509019.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/88144284810.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd681cf8c2---67705209817.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109071652295794.pdfIn PDF document text
    • 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 18344 bytes
SHA-256: 7692c1c299f7ea3ffb72a0693fcd632e7ac547b78d9b546bca526d74488b9646
font_02_sfnt_off000137b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B4 10832 bytes
SHA-256: f1360391395be92bf93e036f9a3fa6a839c9b4aed4adad72ac08da898f36512e