Malicious PDF — malware analysis report

Static analysis result for SHA-256 284307c3726c5aae…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 20:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 147f2c2d0f1ec7da1c81b7718d2ca001 SHA-1: 6cde1b867b842151eda2c1a599c5619dfc48e360 SHA-256: 284307c3726c5aaeb30df7158e91132704cfb7e41ab7b88fa02306c1961e51c4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The presence of numerous external URIs and links to potentially malicious content indicates an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3238

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://twothirdsmajority.us/clients/38522/File/1222656182.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c14a20f827df60de5c9df1bb9e2d81e6/gekotilo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b7f61c81e---muwamuxogimabisoridej.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/71335547785.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f57818a4f2---72341435614.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/fodepibukazinanonakoduwal.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/18372bfa4c706e3adce7f43ad2bda91a/gotubolu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888bf4ccc63---tomanezimufuzaviluke.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c9be441c---fukubabor.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/liwazupiwifo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a8442849---nejimaloxegozujirike.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/tominuzunegefuwijowobojip.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f1ec05eac5625e86fc45b59eaebd9f3b/kefiwabus.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/36cftr85dh5id8uhka2mg5b9bj/gisoruxoneke.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a96763a3208e682f93e8d268472fd80c/21362546727.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///70138618033.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0313e2603de8f95fe1eff15b15ac3054/15163854439.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e137e8af0---jufikarorug.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d05e9df1ef9f4efbab2c9e14fb0737c4/97472831423.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/81544195824.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/45151254845.pdfIn PDF document text
    • http://guchenes.com/d/files/33232008827.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/39046949603.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cafe7f02a---lutixorafa.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/74028293280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=indian+classical+violinPDF link annotation
    • 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_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 17412 bytes
SHA-256: 7c0bd3429b8e7bf9a2294c4fb4ca02f1bb3979a565d5f7f97e364d6f28e65d76
font_02_sfnt_off00013b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 10052 bytes
SHA-256: 7f971d16d6757c1d9171fad3c10e0569757f0cfb6f1b952bebb30243f1b9f5e1

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