Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca61f4df96f2e8bc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 17:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 187404cc11dfeac60ffd7eadccc267cf SHA-1: e4df9afaa0e87ce12c6ba9342c75dd9a1ce9021d SHA-256: ca61f4df96f2e8bc7c4c9144d4f951cb5653f2e566d9914b55d63aa32645da07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm. Several heuristics, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://quangcaosmsgiare.com/media/ftp/file/gudosokiguw.pdf In PDF document text
    • http://www.fuchingrading.com/upload/file/65214953702.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece88206d---99161892317.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/silakefukenebota.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/65553913858.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6al825tfukl8bn2389forr1hcr/90964721361.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/lafosajomarijagafuwode.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/3307062553.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/18925040968.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/51973616205.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d5c5060d---rarisojalikigijadopi.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/22837143619.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/noguzudexakipivi.pdfIn PDF document text
    • http://naso10.com/userData/board/file/lorubi.pdfIn PDF document text
    • https://tigaintan.com/contents/files/jobutinuxireki.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/34799220014.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/xawiwof.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/22962966132.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/pisivinodogaf.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/sozalevokadujalivarejud.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/nogijabetebiruk.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/fidiv.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/vifiwupuxavupiwesevebo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/89b7a8a7a06b333f8d6cbfb042c1dd5f/17239172183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=deplike+full+versionPDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16696 bytes
SHA-256: f67a5ec32ea45ac930d89209cbd17a7d0f8516822a0063a415abf0e3a651ea3d
font_02_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 10348 bytes
SHA-256: a04fe60e19ac7bf17172c257521fc9b7c2a58c8d23f181b2290c00b66bdc6512

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