Malicious PDF — malware analysis report

Static analysis result for SHA-256 67636e4a23313fdf…

MALICIOUS

PDF

92.4 KB Created: 2021-07-27 20:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08217c95ad4b273574262e18dd8b6268 SHA-1: bdde4771cf24cf9564c35fd6fd00d941fe700b5a SHA-256: 67636e4a23313fdf4c438ee28bca12588df2e79efabd8ec9604c595952ebe8b9
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://annandale1963.com/clients/69704/File/rizukemezakamusazogopos.pdf In PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xesobegelula.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/75922358434.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6996ff90---minetomijale.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d848c6cdf---juzivewopav.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/25315475961.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/84006404927.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/880235956d7f6a3b9933f8556f7ca175/jatagad.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/77212241412.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/guwevoramim.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/55728571461.pdfIn PDF document text
    • https://unitjaya.com/contents//files/fujoforetakunesuboxupiwap.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160718ef8e03c1---2825923031.pdfIn PDF document text
    • https://highrise.pl/file/23045906062.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3fabbb02ed3ca1de546b071c47ea5f3b/jelija.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6fae9030eaff162f3df07b28d4883cf0/nutugefinamabefe.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/98917317634.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kametazekedopiwu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/5782572051.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a445f89888---lamesuzipafadiruvovurukom.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/nimunolojojivake.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d9558f1d4b0ea0518320a78eea2e0503/8135180412.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72e3e1c231fafe428cbe727668efc019/vugajoxobulop.pdfIn PDF document text
    • http://attlas.center/userfiles/file/mokaturitewadadigeja.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/75761798532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mecanica+de+materiales+beer+johnston+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_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 18424 bytes
SHA-256: 80301c3f78b04239822f64052d4204651a0e14411b48c54cdaac180287416f96
font_02_sfnt_off00014792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14792 11148 bytes
SHA-256: ea2b9c405267683d9b3ae54a32f1af2b171fe4e5f5c5b6fe90eadb78e76a2af5