Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc88dee0ef5bf84c…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 16:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b41fea0925036367bdbd11dee0044cfe SHA-1: c0cc037f92f93585985b1ddd4d80050a56808566 SHA-256: fc88dee0ef5bf84c5ccddc33506e38302974e11e64424e759f4fad0e4b701152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous embedded URLs pointing to potentially compromised websites. These links are likely intended to lure users into downloading further malware or engaging in phishing activities. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

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://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/tesedumiwudezoteja.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146efe1737f8---53874158898.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/nevibuduxeropabidedote.pdfIn PDF document text
    • https://sim2007.com/files/zobudegisugan.pdfIn PDF document text
    • http://koddous.com/userfiles/file/98614443854.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/79493579354.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/pawizutaposalatuzid.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4j31c1g0a6iatggta5u591rgfa/11332370998.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2968acd3a6f6099285fcf55628d934f/fododes.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/17773395851.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/29003565417.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210926160147.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lowadaxe.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/kotavibevan.pdfIn PDF document text
    • http://bndweb.nl/upload/files/63765197023.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf9c18db62---6389023867.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615676988b2c4---78579138159.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/xunimowol.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/vefewesaxewewemomep.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/15268291515.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd28c21812---3630317052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=general+form+of+a+linear+equation+in+two+variables+isPDF 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_off0000ada7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA7 10952 bytes
SHA-256: 848b4c280ae844ffd7317859a1f39ba05326623b88edf6d616396af9c897d8ed
font_01_sfnt_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 15264 bytes
SHA-256: e22ce5664ed3c0dee8dfa560e60699f69da34a966fe73d6630b5fda35249aa91
font_02_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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