Malicious PDF — malware analysis report

Static analysis result for SHA-256 a809bdf5655c83da…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 01:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 071097a2114100ac4a1f3974c0b39253 SHA-1: 9abeacfd90cfa6b9eb4d97bfe46f941426642a41 SHA-256: a809bdf5655c83dac0fc30722950fe88fbd134baa527b47e7f178c56ae2e18c2
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to other PDFs hosted on various websites, many of which appear to be compromised or disposable. The file's structure suggests it is designed to act as a link farm, directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=freezer+mod+apk PDF link annotation
    • https://my-natural-style.net/upload/files/kirabamegupejavadifa.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fovejijataze.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/vupawesareg.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/42901388356.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/27ug0vefvu9rvpv6sbgj8j3a6s/zekilidiwotakuk.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tibapitunudelawoxolirev.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/16638515830.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161435e06b93f7---61820420395.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/kipizodukot.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03f568edf---tomadava.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/mowobujiwoxilo.pdfPDF link annotation
    • http://pro-group.ru/userfiles/file/30047522276.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/86179284557.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/47816677551.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613f2fe782465.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/14319780790.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614614de9a88e---22873481209.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/xigewop.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/87238918373.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/gigadijixabob.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/kazidojelijapevilevut.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/43558724777.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///38121824614.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/28278577840.pdfIn PDF document text
    • http://potlista.com/file/files/jejebikoxevonemido.pdfIn PDF document text
    • https://empresa-venta.hr/files/16609538530.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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 17752 bytes
SHA-256: 603579882ddad0d5ee5c60093a8a02ed706530b3f29ca2f7353d596ccfa85542
font_02_sfnt_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 10176 bytes
SHA-256: 26518430a43bedfabdb10710658303b0ec0e9fb8e57b908d3436bb77cfca6c73

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