Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75f9055c87a1701…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 23:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc89aff7a0bf9009592cbb8d3074a39b SHA-1: 1cf09dcce69b1bbb7e476185326b0ad72dee4c59 SHA-256: a75f9055c87a170171afc14ea5c440d8879cf7be286d34b795e7b7dd12d40ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, forming a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO poisoning or to redirect users to malicious content. No scripts were extracted, but the presence of multiple compromised domains suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6e5e6d8a0---58337146973.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/97572068622.pdfIn PDF document text
    • https://artbynela.com/uploads/file/42340496199.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e12a8e5539---temuxexunelak.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/930043a56e8b43e90fdf943df7eb219e/80418301394.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a1ca46268d4cc3a2879914fb9e22a075/navemolaxexudazibazopuri.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786fe8774a---92139904762.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a375b9eee7---60020193496.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/lupozojukadawe.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e7f724a5d---xumaginutut.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8f1b414f98b8ec0c68505d7973714d5f/44001956118.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/furataz.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/52779096319.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a8cb46686147a286d606475ce40e9460/rafunedajudipuwikuniwuko.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/4653766761.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/95026629680.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/fa390fb6b58446cb153991355791089f/43197848038.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a55f3eb7ee89ff08df5183bce6bcf8ed/detejazeso.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b1f4001d818206a20d4614eaed41d3ac/36560014656.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/61869385718.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a280bab3db5aef61d1e28cae61b1289/letis.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f69deb958---xukizufozipu.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/61437998671.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/voxabem.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/kenewejisoluxavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=properties+of+3d+shapes+worksheet+year+4PDF 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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 17572 bytes
SHA-256: 9d157a8919566b0128d9f642d0f0253c8ae0c98f71b919dd9834073fd68f887f
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10988 bytes
SHA-256: 4fcbab4c90daad253f4d6bd05570effc36f3649baeb6b1566bc9f51572d6d7b3
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.