Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c9b80d086c4038…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 19:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee686dfccf3ac24112c63da81d06d324 SHA-1: e7a6173059166b765054ec652010e0d7a20da40d SHA-256: 70c9b80d086c40380c6f261ff3e4f2b10a9a20a1b65fa5e7c1a67775bc86874f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO poisoning campaign aimed at driving traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=celulas+granulociticas+pdf PDF link annotation
    • http://tajilin.com/upload/files/vavomutofozakop.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59b286376---vizirewitupupajila.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3fd7977207a8496490ab0107730032a3/49876159473.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee4baeb331---57561418893.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/46026643155.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/40789718504.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/19708816511.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/sotuwekuki.pdfIn PDF document text
    • http://nemalipics.com/81864639947.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/27635472955.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/11112947532.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/75776583051.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba40b01335c---pazujuwe.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1a6760d469e8348d06cec5ef37bf3eed/48037350129.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fd63f37cc---joxinevogorisosave.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/beliv.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/wibonala.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/89394801181.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/74458234639.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6a4a0329---75990657515.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/voxed.pdfIn PDF document text
    • https://airbays.com/userfiles/file/57108043753.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/novedamin.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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 10928 bytes
SHA-256: db358305130a3e621c7b1c0bdb11f7f28d39c4476c4e1cd2d93ea8a6f339f082
font_01_sfnt_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 16992 bytes
SHA-256: d991c6236b10a8b0b6b1d03fc0db6eb026e286eb3730fd9edb60753ac23d3a1b
font_02_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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