Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc413b903af2ca92…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 20:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0858961e8ef557b5e238de3b67dd0b2 SHA-1: fe1eabf861117c1d834636cb4bc09704b5e29d5b SHA-256: fc413b903af2ca92eeb3d6ab817505b8acd1222450fd0fbb11ec9323fced0cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to PDF files hosted on various domains, suggesting a link farm designed to distribute malware or phishing content. The presence of these links and the overall detection by security tools strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=dex2oat+battery+drain PDF link annotation
    • http://gianphoiduyloimodel.com/Images_upload/files/40248728363.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/rumosadutudojisugavuvob.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/28450338493.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/26184970513.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/58815163442.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff98b22b80---64045249596.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///zuzumafobunumagaferitutag.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/62417358624.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/felewegol.pdfIn PDF document text
    • https://emprenderem.cl/files/luvuse.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/nabanezabokitutisu.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210922143056_9b9pbr.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0911a4fd10ef175e3e8a817ffa8fe62b/49959029283.pdfIn PDF document text
    • https://apra.pl/files/file/davopikigozorumal.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/84087569991.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j35iiv969a6c64shmh2f8eosm4/jaluferadokerirumuxavoru.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/novatonas.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/94636063604.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/xanigofopir.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109081147541014.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/vitetewug.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/kerobonoredazube.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/pizevunebu.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/47726885598.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d2b34a6---risopodovumufevujada.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/37643250539.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_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 10504 bytes
SHA-256: 3be5189c2996e5d02a49fe1a30e56f0e9429c206154bd172ef7236bc852976cf
font_01_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 16632 bytes
SHA-256: a6bb767ac66777ea53256b2347dc154ffed5404a6e0cb3f117b9cec955bea8ea
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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