Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c08206820581a8…

MALICIOUS

PDF

87.5 KB Created: 2021-07-06 18:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f55ae41811be33be2e818540fe885904 SHA-1: a960d2ec40c5d5cdc28e31f056fce77140c9ff06 SHA-256: 53c08206820581a811c57c50366c467206b99f88af69f877d7fca0b3de3d5daf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are identified as compromised WordPress installations hosting further PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or to serve as a distribution point for malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f7d0456a4294b6c1e8260e1f3d01f283/gitalujofukabono.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a32535a1a---72478327241.pdf
    • http://firanywiktoria.pl/uploads/editor/file/54332880320.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/76669179587.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fee5b1cbc---23645942443.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/a2p1ms5vippphivfsfmk00fe8v/67011953132.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e78f996---ladofukapaweposagixat.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/guvonaxawudibenekebun.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099f151a1d3e---davabanis.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/dfcbccda07ac1b95c1dba52a4930a740/ronulab.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c80a7065---velerurabazokiruvugeviga.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b6afa04---39757461197.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/717511754462d6230c29be86f5d7be15/lazewidobageximuwupewe.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607870a579b86---jenatekutorazujujuxatugi.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0231d11cc1---50712354463.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c434c8803cb---pasem.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/zoxujib.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4dcb00e1---61592576532.pdf
    • http://anhbanglaw.com/userfiles/file/niximigunulidar.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/peterejaredemekiwalokaf.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/29f971dce2d2f30e921e6826e7538453/59124014937.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nmg1c225utqnhiu19kbfvgpi21/20209009873.pdf
    • https://denizlihorozu.com/resimler/files/34785278177.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53609ec9ef---23585166075.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a304798f3---jejadebefakenixuxenosaxut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+greatest+prime+number+less+than+50
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0aa.bin
9140dc3625d2afc4d95626e76fb1590d99602a28a53285f3a864de85b3f1af47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 11068 bytes
font_01_sfnt_off00010a18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16792 bytes
font_02_sfnt_off0001222a.bin
3b50fc30029bc619750f40c7e70d8a2a2972b8ccbdfaca37b30b3ec507628ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 17588 bytes

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