Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b111bfc2f70b8…

MALICIOUS

PDF

86.1 KB Created: 2021-07-28 01:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77a745c002f489f4b24ba7b8bc2639dc SHA-1: bc5a4e4836d155a35310f9ca26d7c4389bc02d94 SHA-256: ed1b111bfc2f70b8d019034b12e15dacd85dc367d7b4a84c7b63e2f0b9e40ee6
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests this PDF may be intended to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://asesoriagade.com/app/webroot/files/files/zonulo.pdf In PDF document text
    • http://planetamama.ru/files/file/novodutiz.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19cdabbd646661859e5efb3cf3ae3201/90778401826.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f15d5bee---54349226216.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/xigukovofimavejogo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc25d0a26---32435869306.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/25462712637.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160847a82bb62e---48885072011.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584e6230df---55281050138.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a138d504a90f821393bfcb86abdfd439/liwanavimufawon.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3c3847e5---loken.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/remigijo.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/37034330865.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c84a344fd---mirefuxoveki.pdfIn PDF document text
    • http://agavietnam.com/img/files/54628202454.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c0785398e847d73cc69e6ef650cf6237/81047573690.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b0447c51a01d268fb5827d0adcebe5dc/lotuvum.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/72727383600.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/007f3942cebc60b5d246a9a7347204d5/pupesajajobif.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21e00f6613e77c7c807fcfa2a3780c3e/23269425443.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8q3s5u7okqt19ul3d8kjq0doa0/59169045754.pdfIn PDF document text
    • http://beiks.info/public/file/tijosamug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=imprimir+talones+de+pago+pension+imssPDF 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_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 18244 bytes
SHA-256: 52beeb9052f88cbad104cf10d739e852eb47aa14cd1091122c0bfc77edeffa78
font_01_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10688 bytes
SHA-256: e38b2a36aa4770e294cc28a90c07704c73d011c6a67e5b3e4be6c00adc1db639
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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