Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc41dbf257e3e39…

MALICIOUS

PDF

88.8 KB Created: 2021-08-11 02:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72ac53eb4c56637a71142cb7d5c6da4c SHA-1: 69467e0a5f6b704ffa0041cc581784b7a3b5e2ea SHA-256: 6fc41dbf257e3e39ec72fb26fc9b614e3f2d0cc82a9ee0a168d7b1a7bf519ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming its nature as a link farm. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's intended to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://lubrifianti-auto.ro/files/file/sobotuvujowi.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9c1be0c3dff9ff24bc0e5fbf1002cf4/28773971098.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/72f0c572d1d12bf7da73bd5098441b4f/pogidijekupuwix.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beabe11e---20505489942.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b39b0791b32c0633789772dc94a0f0c7/26264910534.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/53695792887.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/30155497398.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ab598a049b787301ffa21af99ad9e611/nifobevepusujadite.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/46c37c110b3ffa6429caad5d5a7d9d1f/ximun.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/sowasixalegatogobi.pdfIn PDF document text
    • http://brukbet.com/user_images/file/5102408710.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dpai9tigfn0sm2q7bbqpa17tfj/xasikidal.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cab16d6f3b---10594768185.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ll8t6slbah1g58jdtp4gu31jgo/wodobuv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161102cf2e209b---94753619661.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/71128296341.pdfIn PDF document text
    • http://armanetti.com/images/saxubiziboditilonep.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6556dcf612---60898030676.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/roxadidototuxoxuf.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c858d27227d---58590614533.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854244a5dcc---duselez.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/fobinapebo.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/72001908637.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a7f4e2eb---xasurabaduzufox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=carole+king+home+again+piano+sheet+musicPDF 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_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 17428 bytes
SHA-256: d2a3c1c1f812f7ce38cd171d8a8ea67e49515db0f850c2394c11047315ead7f3
font_02_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 11044 bytes
SHA-256: af70e1fff320df6d6af99dd852db4711574b71b1b32c097ac77409d33218942d

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