Malicious PDF — malware analysis report

Static analysis result for SHA-256 103d24feef10ebde…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 18:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e903a097db5073c9a1f995fd8128dabc SHA-1: a3d8fceb177fcd02026916691f601945eacbf81f SHA-256: 103d24feef10ebde97d42e9c193a32439e23db51511d94540c572dfcf945b7e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content. The primary attack vector appears to be a phishing lure, likely delivered as an attachment, directing users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=dubois+talented+tenth+pdf PDF link annotation
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/vutebobifadiwibasut.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d06daf1857---sarixobapeburesokusolini.pdfIn PDF document text
    • https://nada70.org/userfiles/file/76747419995.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/getajaredubowababa.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/34074013757.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab5dbe1d4a---wufariku.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xiturewopexofedir.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7b146dfd6494e63849646ac479647960/44079994760.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075bca6ec129---17095461023.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razosenegovomu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/kemuwepumapinuzapaper.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/04atf92te2r5i85ld5jt5a1921/sixokekawuz.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/30266716490.pdfIn PDF document text
    • https://atl-50.com/files/file/kumuwusiwop.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/kafel.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/44051444787.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/tenapudixomevuxifak.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/86292783700.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85295979ca---4459705003.pdfIn PDF document text
    • https://olterus.info/contents//files/wekejuxorozalaki.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/50011429264.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/14964b0d8e56bcceacf49464d8b78208/zujalituga.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 17860 bytes
SHA-256: 3a1858dc62117d8b7f24b433666778abb68510bd8341b439a80ccbc59f725b94
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 10736 bytes
SHA-256: 8b5d2b4aa082486f25417a5762bab3583095f62b25d7c14091515e2d954560e6

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