Malicious PDF — malware analysis report

Static analysis result for SHA-256 d028ece80bd47a4f…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 22:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35525e2f002edfe518edb172400d69a4 SHA-1: 621e0e723093c4416233e300a0780f71bd29cdb1 SHA-256: d028ece80bd47a4f24eb382199502eb440e2a5aa964767e338d78b9d17afb589
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing pages or malware download sites, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5102db2fe---vemixegewepezak.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c12064133e5008292d82de76d1e2db4b/92120442918.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbdc72df3d---61391555931.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073e83a25527---keninomofijipamadorugi.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f1fe8b40---redaxesopexutuvaleb.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/37749e238d7d7863730cc2c09b1f4e87/sipigibegabitatebifofe.pdf
    • http://elitvorota.ru/f/file/21352604929.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/63461826211.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f7f074f4f---mewakevozesukexov.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb694afff---60867579115.pdf
    • http://kesherisrael.com/uploadEditor/files/54352577469.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/99a3f8b07649188794111254d212dbb5/43759179103.pdf
    • https://sgcaregiver.org/contents/files/98207924895.pdf
    • http://mywayrtk.info/userfiles/file/25969479852.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/eii50gqovfbu6kfve5rfmv48nl/70884258252.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/28eqmgvgtpv00sa8cvoo4i5i0d/69655551001.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a02518c46---wanosamomogof.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4a23c08ab9f54938d18da180fd231bac/vobovesuke.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/75got37u79efc60mm85ar85cmk/wibabotizobapuko.pdf
    • http://lideparts.com/userfiles/file/1623743388.pdf
    • http://www.bluewhaleline.com/image/upload/File/81592397346.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/df2bd168d4d5c4dc6737ad9835cd7504/75796834408.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9109a2b1ffd64e880c239c2d3ea902ee/tewasenisabifigabugam.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f6486d93---xunurasexuxaparel.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da079f22---dajol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fort+campbell+range+control
    • 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_off0000e7e3.bin
7bd86cd7f1902e70acfcafc4e8664a3fe4d4d15806375b171f1137db22464486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 17608 bytes
font_01_sfnt_off0001165a.bin
4068c8719213a5edf3ce66703e27fc1bdaccfc10ebd4e88dadc3bd92991c3642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 10572 bytes
font_02_sfnt_off00012e3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3F 16792 bytes

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