Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b20a5854175997…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 02:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a4cb6fc352c77d237bed52f26d9ff5f SHA-1: 336a149562c46c418e9c7be2108b4d7c77356a0d SHA-256: d2b20a58541759970435bab3fa56167a43ec15b2f02e5849f1f234c630204741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inprovitpuertorico.com/ckfinder/userfiles/files/41047392751.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/45320316411.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbe36fffc---kapawikozudosebew.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/8900156046.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/puzavalumevazo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_D44B97B64CE1CCED.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zodazugosozorikawigabalu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139e04ee787a---sezesumowubefo.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/vekutubugixol.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/67931057849.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/98375009730.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161387607cc4d7---57645923530.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/48864491593.pdfIn PDF document text
    • http://portableandcool.com/files/files/4792875475.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gelopujuwasexutogulonefe.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81509645015.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/23932942080.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/toruxefutobefapasiwepaza.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/figejexazaxamaxoma.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/dufofotuwa.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/vofivodatunegiwupuxef.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909124938243.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/95818776891.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/65777212538.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/fesesavevudog.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/rolugel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+vr+player+apkPDF 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_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 18780 bytes
SHA-256: 2ad25abcdde7fcaa4a0b51a189e649d9daeb48ffa6964a03cd6e3eb059cca279
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10732 bytes
SHA-256: 86d40a4876ea8f19f63b2ec07aa0fcca758ddbec32b7f5eb0366a8169901d352
font_02_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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