Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca676f0c9f659da6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 11:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 579d788c1a7f1399ee933aab57b738d2 SHA-1: 2b02f67d25c6912d8c7c1a79c39eb2e2133e5ff7 SHA-256: ca676f0c9f659da6813c011147bbec703211312167362d893a03a0b76c0dec29
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://naucseto.cz/storage/52258550772.pdf In PDF document text
    • http://posekatzahradu.cz/files/file/gevapasixumulowelulik.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3fddd2187f893141a1a0d1d8fa1d4d11/62163144164.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec3519745b---43207198277.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/28934141831.pdfIn PDF document text
    • http://zerosquareonline.com/file/vazixujorofoxopenidof.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/13021089599.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5e625599---29663573809.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/613881ce822195596c72c4fe418a561b/70858472845.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db20919953---gitenevovegurek.pdfIn PDF document text
    • http://teplospectr.ru/images/files/9154930751.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/wavegodisivigafofisixus.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/bewivopulikixa.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zusakulukasitutogetuza.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/dilifukes.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/61001820784.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/bdeb76a807edac1a5005d1d1bc56b058/14555323694.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4eec94610---71086620294.pdfIn PDF document text
    • http://alvitraders.com/files/15168384711.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/sitemelugosaw.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6133216c4f266.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f515c1491b568b990ec756c376f70b46/bemupewewugurom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=neither+nor+and+either+or+pdfPDF 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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10360 bytes
SHA-256: 43e0b9ba00d3b4235d43decfc65f836f0334da880e53fe4794d23c05df701f42
font_02_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 19300 bytes
SHA-256: ada8e94e07b95a509349d5b96eed329e276f80f58c334e53a7a76cfa0ab996ba

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