Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc18bfb45726eb88…

MALICIOUS

PDF

86.6 KB Created: 2021-09-22 20:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37a8ec5b0d72c4b3de83c97ebe549e79 SHA-1: 891c58b3d04b45b03b512e1d83fae5d47135140c SHA-256: dc18bfb45726eb880c02e2450a31b9983dadc7d2e1e1cef91a6b457d9645ec15
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into providing a password for an archive, likely to bypass gateway scanning. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous embedded URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://findmealocalpainter.com/insurazon/admin/userfiles/file/gefuzijavegikijum.pdf In PDF document text
    • http://321eastern-thailand.com/userfiles/files/56313528079.pdfIn PDF document text
    • http://stroi-sistema.ru/img/lojixaparifegavatov.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/relotovosavapev.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/jupejoxemapegito.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/67102705388.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/panib.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613590bc930ef---34772470461.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/76567865089.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/zuvofumujuminozezixukag.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210919005731.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/livibozavoxelajogazet.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/niperude.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/nulojosujovuxewukibix.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_A9FBD0B3B13BCD49.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ad38c0312580c34bfe12af56ed676707/xujen.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/37196476229.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/184d64ea24a64efd31d10fd4a0fab29a/sibivefevi.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/86533499520.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gekexosuzipaje.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/zevawagomodoziteke.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/50060126535.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/24475893763.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/tetasibuveki.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/salolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rockchip+remote+control+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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 21956 bytes
SHA-256: f17ed61f31a37dd4e9015c5a0af44073e9e767a6fc14ba7a8f81593ad549ee27
font_01_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 10608 bytes
SHA-256: 1beebc35df74cf577cd34a06009050fc6155b532a49ade7e44b0a2c52c21aeb6
font_02_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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