Malicious PDF — malware analysis report

Static analysis result for SHA-256 419fea8d77c76035…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 18:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a897dbde5015619c24367e565a6ae101 SHA-1: 1c781e5dc33d05eea3195fdeb559efff66eaa637 SHA-256: 419fea8d77c76035ed9972263fcefcde036f6b888bdd611a976ff15a6da81017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary purpose is to redirect users to external, untrusted URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390d5ea9d2---28459153462.pdf In PDF document text
    • https://jin-ji.com/upload/files/fibawabedizekowanumi.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/kunerunakak.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/40735852506.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r5qrn371vrpiuf1uqa7k40jq71/fumiv.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1d82dff71429d7c534af73301183cd09/numusela.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/parigikokemiv.pdfIn PDF document text
    • http://signauction.net/userfiles/file/giporisinusiv.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/winebiberidonixamumimimis.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/vetoxavajat.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/dezozopejedefusurikes.pdfIn PDF document text
    • http://chapelguild.com/images/usr/58618284867.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/pezubosini.pdfIn PDF document text
    • http://labotinnghia.com/img/files/zofake.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/lateduxalevix.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/tatiwidedirovirinubelareg.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cd934d13---mafugilosazunubijinomikus.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/41809038104.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/248449158.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/lapunewimawe.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pufinibakizolaxofujapoku.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/87a2c92d56e9b2433f77f7bbe93d1c5c/gosokagivowadamizupexiko.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/galivozamabajuju.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/81021899380.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/96272086685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=degree+to+radian+javascriptPDF 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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 17212 bytes
SHA-256: 726f5dac4b2d23b6916b43e36cf2b7283b2b6311fb5aa5a9552c76af7b72b819
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 10840 bytes
SHA-256: 6a6a82430b1ad140c616d0904147f4c0c0368bb6824ec56b347d0ed74a7f81a8