Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86de26df043070f…

MALICIOUS

PDF

77.5 KB Created: 2021-08-04 03:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a66a96192a480e65bfa9afc54bd85e8 SHA-1: cfc55498c2d581f6c03d50c35c156d6ac9c02521 SHA-256: f86de26df043070f94db989098b067db37103fc522d3710dfabcc388ca111020
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it exploits vulnerabilities or tricks users into visiting malicious sites, potentially leading to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://arvikabc.com/images/uploadedimages/file/80121240024.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9acb5b76d---20421863641.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/rowalabajunojipasukivum.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/67927097325.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/20fenp5j3jggf7p96afat56n02/53243408004.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/199e11d5c2245e0e2a852f0103702436/dowijuvexuwiwujamulime.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084852f6ad7a---ruropiwixek.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/64418578915.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccca5a49e8e---zelokinafizisegamumawo.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/98755868567.pdfIn PDF document text
    • http://heizler.hu/files/file/85860586340.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba64760112---timisesajilotegitumokasov.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/70887842773.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c53df97672---43599053919.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/21115702927.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/sudiluwojuxupubomal.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kozanifod.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/vesaw.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/rozolazujaputovi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210508223135.pdfIn PDF document text
    • https://ccskin.com/geektic/files/gajubavopukekeboginu.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/gerazavopazixo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510115640737.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/73160092235.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/43283364432.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3822de38be34b2ec8ccdb06c2748c20/pepinudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+de+trabajo+y+energ%C3%ADa+4o+eso+resueltos+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_off0000c52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 11400 bytes
SHA-256: 46b2c49255e6bdb08d613cac0b882dfb567d1feed765ad70dbd591e0d3a12f08
font_02_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 17256 bytes
SHA-256: 4c9975991a0dcbf3d3e2dde23e5e7a658ed0989e01c44829202e7a165c11bc47

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