Malicious PDF — malware analysis report

Static analysis result for SHA-256 171cb8d8fbef4839…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 08:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0fb86c1e0db13fc0e24d1b68c2591de6 SHA-1: 92488dc827ef97c2cddb4546a1827a4b0a9a0618 SHA-256: 171cb8d8fbef48390f52cb965d81cf24e557744bdff50b8df490b9ee0eba6705
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.anieliasfx.com/uploads/textareas/file/sixebizarevajomunota.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5ebd96685bd6e22e382f553c43d2e0c8/90028062270.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/rekulilunukebigunerolo.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/20542504190.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/maxuxinuwejibez.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/lubafox.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/7eb7d1aacc20d5e01f491a629f1870b6/ravatezavemezinofam.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161268d167f272---33665410434.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f29bd74f0---22707155086.pdfIn PDF document text
    • https://temahr.hr/files/68908153926.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/warowadevefabob.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210819_88A3D98915845FE1.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/57bf07d3484acf8ce15b694a1d5e0554/modaz.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/94296250868.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4df60e6d994253a8480d88e9f9b8a92f/noxoxijilomubilumaluv.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/50156733625.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965eb8a69b2---32650671119.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/99993209410.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/1872549042.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/18110056010.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fe517bfde25f2587ad868227109b53df/vasewakarukafed.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/40629259705.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1045654f---78544336201.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f5e4b954013a3740cd2d08ca0d529267/78439772228.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/85583486144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=statistical+significance+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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 17068 bytes
SHA-256: 05f7f286c60640c9ad50f3d5ef609ecac2eb919b779fe60f184c3fb76146dd43
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10648 bytes
SHA-256: d266f6ecbfe297753499dbce11dd1d6f28024e55779c83d3b2d6186096b1030d
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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