Malicious PDF — malware analysis report

Static analysis result for SHA-256 e817aefb165fd479…

MALICIOUS

PDF

76.9 KB Created: 2021-10-14 10:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 12814e29cef296dcaddb25eae2d3af75 SHA-1: 7efcecf1f47510ab41b26a4820e49b8b9850cf66 SHA-256: e817aefb165fd47986a03df2759d8db8ec3895375a149d6d01fb7b39b0904995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs hosted on disposable domains, a common tactic for distributing malware or redirecting to phishing sites. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f1814579af---44281668431.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///pazixugezalosomoziru.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kivimabaxajubuku.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/79117156347.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/jazewupi.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/68516851445.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/zofanapoligalesaroxi.pdfIn PDF document text
    • http://3q1p.com/upload/file/21091713432027900273t3ladjrrz3.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/60996175532.pdfIn PDF document text
    • https://parkettworld.com/upload/files/27018080497.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616292486d274---kojizowuvezixos.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nufaxodaduvikuxa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161599cc1cac7d---47959395822.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161418cf8e36a2---78547366930.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/dijimowajovelupi.pdfIn PDF document text
    • https://mklaw.trakhes.com/dir-eg/dalel-eg/userfiles/file/wowijeta.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/jenuf.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/89344611459.pdfIn PDF document text
    • http://www.centralperdana.com/file/18840231842.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109112018153046.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/66869942707.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3280681bc60903ed401c314e4bb63b8c/fojugopenog.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/sojak.pdfIn PDF document text
    • https://semut73.com/contents/files/23990738196.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=elsa+pictures+for+colouringPDF 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_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 18064 bytes
SHA-256: 133d5f09b81c38e4a987044ff981aed5957fe0e0bdf89df75f710f9ff0df8a11
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10736 bytes
SHA-256: 494a0548df32272079ba88a6ed1d523eb31cfd4d4b8c16dd927750847b64f0e7
font_02_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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