Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f1c1a379406741…

MALICIOUS

PDF

103.1 KB Created: 2021-09-01 07:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 035b1a13a6cbbc6202da9903f587a1fd SHA-1: 53b53b6fe0de6c3d90c5ebfe44e9f47b0964ecb3 SHA-256: 77f1c1a37940674198545071f5a5e5b6febc14b647ead156cfef77cfc898d57e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed0fe9eb9---giguvarojizumika.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5a7fda8d1---9361973200.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/rukapugibu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b99a8ccea---nuzexaz.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/79696533034.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/06804503ccbf53fdf0ed2321c2245f4a/67893234014.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ae20tp5dh9hm3tnaajgci6trdj/86431453303.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/41921903647.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/22878637773.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2368fa291c---bugakudefaz.pdfIn PDF document text
    • http://scro.ru/pic/file/45390015953.pdfIn PDF document text
    • http://tdbm.vn/upload/files/kupoxujetud.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/regufugobo.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/bafev.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/73340014587.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837f01c9bc0---buboxusukusujegupulukebek.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/46568261876.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/23851961327.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d65cb1de---2983708203.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jamofumugegawomox.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/vigur.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/pcjqopjkhqankgd0rerlvjrs3h/21130864555.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/bufoxowapunob.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607456e84d3fe---23894959683.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/737c81e98fe27e9bc8f0c33837c721e6/lajakonakixakejezoduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=otherness+of+the+otherPDF 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_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 10036 bytes
SHA-256: 9ad984acbe2224fdc7cfc61229aeccf7d23e5331b1147cf4e7579dbcbabadd36
font_01_sfnt_off00014393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14393 19304 bytes
SHA-256: d325a127a92a5444488b9568bdbd9cf5cc15e5d96dab44c7e208e03cb675d230
font_02_sfnt_off00017594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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