Malicious PDF — malware analysis report

Static analysis result for SHA-256 64affa9df0a2ac8c…

MALICIOUS

PDF

90.3 KB Created: 2021-07-20 09:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6596adf82afa238be7be7ac160b489b4 SHA-1: fd7ce66065b5b105f73e29ae234337692062716b SHA-256: 64affa9df0a2ac8cb9c0b99cbc7b18e6f21edbe022e6e7d4f93b39fc3344ab8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/665e8eaf01bf2e649dfb92ccbb65a157/26700397360.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/pukixekopamasi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40aa41db69---32554202047.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/75332334710.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e0e0a26e126adcf5040df85af4ce3ee2/59044255019.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/kejodujike.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea1b03048---16292359047.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0d841caa---miguvemazekawutujunoma.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f3bf71f1d4ab92f146c36675506e5deb/tumarokotifidibalavirora.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d38ff6b4ae6---37654884928.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/19407013907.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/tolovatolab.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/eh2ibep29j0u9ga9ppi7g1hnep/22532339539.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/tudoj.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zubiroditolemogepum.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/23223478776.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/74bf4120c8320c264d2b96aa12e8391a/48419967637.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160add06bd1385---71580814765.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d547883faf9---72372874281.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5180438ea8ccf4d4fde0beeaa1dc51dd/lukaxadozagomutoda.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/nutobariweraged.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b8abb4e3---42025038351.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7d6e3910---tipomotegosif.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/81553845917.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5e5860f133a81b60dbab6d5798915dab/kokuxutilekekidewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=train+to+busan+2+reviewPDF 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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10532 bytes
SHA-256: 51b9a750679e9f4bc9cc228c1202991180c1f32feb70abd3c151934429a80be1
font_01_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 18400 bytes
SHA-256: 2991a26b77d7971922dbe48147921c291ae89a62e753f5731446f7f88642f34c
font_03_sfnt_off00015292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15292 1916 bytes
SHA-256: acdaa0d7e10838ca9b78ed08226977778450989d42421d9c52b8386d77d04eb0

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