Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f257622e7cf586a…

MALICIOUS

PDF

95.8 KB Created: 2021-07-07 07:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 729e6b67a77757fb123a11b5c6b21a1e SHA-1: ad6dd53423f651db38788dd8bc3e900d02da1394 SHA-256: 2f257622e7cf586a9c3aa62ef0c45a948f42e17524e3787f43b5fd85b81e8396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://airconbank.com/upload/fckeditor/file/tuvavekiteraminekenuwab.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2a3d60a8---55143932532.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ce80c5b6---relexu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607be52910e98---jebenotufetomef.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/5220391428.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/65568408471.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/75854494668.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8436a6595---36716336710.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6b720381---15807469208.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/od0gcnmdjqsjkcrd8ggabcpulg/kiligosixoruvurawetevolux.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce9dd26df12fc8467237c1180b87051b/84321861089.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/e3q48bbt99rn93pnc5saupv7av/54649505251.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b1bc0442da94d2bad62443d21a959d68/tegikibazumufedumuxevusi.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/d582da95e8df979e2998b54efb36f3a0/27581799825.pdfIn PDF document text
    • https://yuss.it/file/44714869581.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ejsfije19762dj7q7caod94gh1/bexozowalojofaxuzorukod.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/laxizizimonep.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/zomewuvagisizamoti.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gqdsqiv4c2en6otdfbt2p599ua/7417888718.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160871c45e1bf1---87129605937.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l5frvv3lc51ph6ok1plpf7334c/54014688475.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7e3r5hi7sn0om6o046avjo91j6/93948170334.pdfIn PDF document text
    • http://gtshotel.it/images/file/xisar.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/wovuwuwakagoxufok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=catch+a+glimpse+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015118.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15118 18980 bytes
SHA-256: cfeadde18d1ea96de2e98a5903ec4db9ea849ecb3edecb7efc3f97f9a1146750
font_00_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 4144 bytes
SHA-256: a6be356114296baf6e769a167a735aeecc122c8c844f627c53ffefa1b4c57d14
font_01_sfnt_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 22752 bytes
SHA-256: 9b36c5f8f81bf446f58af4086f596e8bc22cdf4b182502ceb333370e167d558c
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 10632 bytes
SHA-256: 00ba2837c1e66370d14c7ad507214733ccb1154f20961f001be4442e5d3bfefe

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