Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5802fcd5ac43cc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 06:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c87081eb1ebd98e70cdcfc512253aecb SHA-1: 23ce57ef979282c1074aa76bdf2efde240e62dd4 SHA-256: 8e5802fcd5ac43cc86b21a4348d2041500505e5f81731bf55681ff4041c43f7f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing sites. The presence of numerous embedded URLs supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dkind.net/userData/board/file/94889433663.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/5dc0cd80e8685ba468f0ffc0e96ea554/momenasefoketebunife.pdfIn PDF document text
    • http://arsvet.ru/img/upload/14851442389.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/jibaboneferufujub.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/vowixaxirejowegivituku.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/dodawejar.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/14109838195.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfa8930a4---gepofubikuzinekexevodiso.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/90879217441.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/xiweredov.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/13315215490.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/18047774598.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/tirusewek.pdfIn PDF document text
    • http://santabruna.cl/upload/file/21897813403.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/61512154500.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d667b54e---54686852192.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/zojoxirovemutupefuw.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/23881199879.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/47814500334.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/mezufumogorimupotabowe.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/vegixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convert+android+app+to+react+nativePDF 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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 17460 bytes
SHA-256: 2636a44a8043a55e07da11cbd241e18750f0474cf1821450eeea71522a13f180
font_01_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 10392 bytes
SHA-256: 0186d47d00081d59864307905191d49c5d7c117944156cb1dc91a6f913c68f1a
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1