Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8409ce91c11debd…

MALICIOUS

PDF

72.3 KB Created: 2021-10-01 07:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 547549a741901fdcefc924b929ccc4e9 SHA-1: 620c46c8d9a631c09bd5fe2809446f93b3911604 SHA-256: e8409ce91c11debded198de48d914729a07007aec7d7fa44627a79b0ecbcdea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and link farm structure indicate an attempt to lure users to phishing or scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=how+to+make+video+call+on+computer PDF link annotation
    • http://torremaggiore.sitmap.it/files/files/5231845161.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/30889341047.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/fa5736c30613be730ea631288a29bdfd/55467084686.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/banewisodo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614743c694508---muzoxa.pdfIn PDF document text
    • http://wsm.hk/images/files/3349047953.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142bee48e124---84846609778.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/kanezu.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48822631475.pdfIn PDF document text
    • http://boldogelet.hu/media/95166955879.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/nojexelujoxefon.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564d15d0f3d---ridinunimizudomupav.pdfIn PDF document text
    • http://adriennemason.com/assets/files/kuvisokexediz.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/sukotugemarib.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/97593853246.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xuwefada.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/73288502526.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/16487105693.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5lkg9agsjbfmsgs9pfulilt5r4/66499525717.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e59bba7cfc8cf8bc8b7bb6db372bf274/73594641492.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/98217434332.pdfIn PDF document text
    • http://sartor.ru/upload/files/rabaguxigebufaguliven.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/gaboridonul.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/tipuzopo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/vebuparobikosukuziniv.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613264d0b8020---buviwetazafa.pdfIn PDF document text
    • 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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 10840 bytes
SHA-256: 371f40528296919232e5ad4b6335dfaea9868ce4493e1d3ea00923481f847e8b
font_01_sfnt_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 17160 bytes
SHA-256: 09326931f1f65c4480113ab772452790c05f83389ea2c767f2bc134bbce0a47d
font_02_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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