Malicious PDF — malware analysis report

Static analysis result for SHA-256 306f03cb87adc8de…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 21:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cce99e5963284310e91ddb1e8797e534 SHA-1: 0fcdbc360c89c870ae6eb37ee503a3301ff55827 SHA-256: 306f03cb87adc8de13db229b660ff71c6ee6f975933b430bf40c670ae4ed5cd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to host or distribute further malicious content. The presence of a 'download button' lure reinforces the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/goziditadobizukatajedos.pdf In PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/52592618618.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/60590599247.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/ravotosowepakexumowogameg.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/gatonaso.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/nofonesobisinetudeva.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/jujaxudolutefaxopetibux.pdfIn PDF document text
    • https://matrixx.lu/images/42658748914.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132995a5c558---rixozesipuwotageb.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mipuvelobijakukoz.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/fupegekuxi.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/86844944510.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/384655742.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/81914015154.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/78126180041.pdfIn PDF document text
    • http://showpelec.com/data/file/20210905_195302_456.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95b377a73c6ee5e5bd2ab16b042fc55f/tizewaditujarana.pdfIn PDF document text
    • https://parc-hotel.info/file/6729467816.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329133cfb43---90509948704.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/37246128189.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/39141411750.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/93004051992.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/04091234217.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/subizexukiwokekekilim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=change+eml+to+pdfPDF 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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 10616 bytes
SHA-256: 30b999fa01fd579f24732b102b414b4aa25b5bb1c57c34f0fd77070b78731fcf
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 17892 bytes
SHA-256: 7db76ef7e4a127b60f623db79f103f8ec8728f85ddfab4a76632e11e3d5e73ee