Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ce0c54bffcdef8…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 04:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 462d56cd3ef8ab03c72d1bf19617a8bb SHA-1: 3c1decbc8f0572f74343fffdb5e5a7595b2f0d8e SHA-256: d3ce0c54bffcdef8c9ab90a2932821d75a7bd39b9fd887cf33539a3e29a0b07d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm hosted on compromised WordPress sites, likely intended to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The presence of embedded URLs and the overall structure suggest an attempt to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f24dcd05f---57135130988.pdf In PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/882c05976e6a89f29546817ee0fd5b42/44419779635.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/872786150687db805992105ebc30e574/zisosatizujosesajik.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a901442a34c0d61c40f1a48eb4664de2/korababusigosavorafawo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lk1t3ptt8094m3hs3ajvdnq11o/bukolifuvariwipav.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb26393b9---zemuvovaxonilinovusofodub.pdfIn PDF document text
    • https://alutat.com/data/file/67194159996.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/54543205184.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/139145192.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/58b19603a6e24bc16a9b9ea90002ca58/jiwiliwuwidijipirenimomab.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091628ce4fa7---74832460141.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c062511fdb---migolevale.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/82323498006.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd291821f---gimejevoretubidubepuwi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6i88nb7ei442r1j7mtdvlt342c/33513489173.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f9844ea9---40425245402.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5b5f19b6---jebugunimuxubofomopori.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021052120432832.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/votebakifivefijamuresapaw.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/begemopemowokuxeguk.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/japotakewesove.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077a4ebe94e5---wutiruwazoxigegolot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ppsspp+games+free+download+pokemonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 17820 bytes
SHA-256: 8c25183df85d0b43717f5fe65fcad40c07b86332f56f3bf822831610a87b32cd
font_01_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA4 10828 bytes
SHA-256: fad27cbc46e5395549be00a00908a4a945255a9f0abd5b9f1c450e6193893271
font_03_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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