Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccd3fa3f7f6136b…

MALICIOUS

PDF

93.7 KB Created: 2021-06-25 20:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df44a72de873b4d27357ec4ccaa35f64 SHA-1: f378e74808b4c1c76a021dc47cab76e84eaf3752 SHA-256: 1ccd3fa3f7f6136b7be97d43c1ac7f9661b443d5ebe03d3e4001c08b189160cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f63b39877f8408edda04bd7a02c68960/37888790855.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/76609604a78515d84257f0aeb6b42aaa/97253347501.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aca820155---tozedenofebujagapi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/80dbddb541d8e57941e6d1cc26cf416c/94183619273.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nikijawopapagosafoseleri.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vogovabonexosadifaxuvupib.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b12fe5640c97d9c6edbfeba5dd6f82a9/61323592043.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c9005428---55356411161.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/98633695971.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/gapebuwutivanamaxakoli.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613e6e04e2---39528004190.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b364951d61d---zusizunajexojogujorefeto.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/63742880054.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/mdv32h7iens39qifn967dspbj6/48607865940.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/31254616143.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/25769277628.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/xojumikevatululetumo.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/kogobe.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/00f8c2622f1da9ce21f54e98523420ae/pepetunupejiv.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6464ce30bd---48916211477.pdfIn PDF document text
    • http://martonelektro.hu/files/file/keludavevamuxisavoxiwak.pdfIn PDF document text
    • https://elektrona.cz/files/file/gezikivixotaxemikupon.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fkth7rvb4jkocnaoph59mpg551/72507901325.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/13220103115.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a9c4867888ba2f58c8965deb340f7cd/nagizunag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=a+vegetable+that+can+be+eaten+rawPDF 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_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 10400 bytes
SHA-256: 1d1069389f14e1947c2ffe9ea22a2f1f59318eb7e20a6c02fac677f078104a81
font_01_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 17492 bytes
SHA-256: ac539c8a952974d6a8a5e4544f49477274e5f9a8bb989b21dd669af0b428de64
font_02_sfnt_off0001517e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1