Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa84f8e430fb394a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-25 01:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ef6b8a5345598784f46c025841d55b3 SHA-1: f5bff4b7b301132f968e294ed488f4074483ffcf SHA-256: fa84f8e430fb394aa7bda66ce2747c874be6e7ed83931157ab3bdbf6ac2d4347
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The presence of external URIs suggests the document is designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://drafthe.ru/uplcv?utm_term=operations+management+by+jay+heizer+and+barry+render+11th+edition+pdf PDF link annotation
    • http://adance0112.com/upfile/editor/file/leduwabin.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/j5irktroo3vmu0be3re74e1in3/gezipoxufuma.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/755fba852398099d89e718e9d2b4ecdb/wamabiveni.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd6d90a60---tuxoxewideworuzetilip.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tujodaf.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73625332a---7235913737.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/7115421150.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9a887e72---14083850001.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/12231225015.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709cfe34932---wikakabevirosidusesog.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/51594075317.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/tiwazevosini.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/nasinadodudu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca148045f0---73154222842.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/eeb8fbb294493872d39566ce6845643c/zutopejutawukotonibazu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/sunokititozamosalifon.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/vasuxilerawus.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/juwuxakepa.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/rikesesetitavugorepefod.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/dujuvuz.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e5da415e5e63f009ec937812d8ec1ad2/xojumobukozuxajamevu.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/patuxonodukopoxodepipa.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/64786297936.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/kiwerudidepuluxokazato.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58338787835.pdfIn PDF document text
    • 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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 11420 bytes
SHA-256: 7994fb4bedd3221aa9d720d13361318afdfe8565b8918d91c97c06d8eb57c9c6
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 17264 bytes
SHA-256: eff074613e8fa9f24e6a80859c6ba514e601e744d098cd724488810749025336
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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