Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1af9f33c65d177…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 09:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f721d26cec88a8165992adc1c12d758b SHA-1: 5f5d32344d50fbf33d9648a2bac6b2d4bc6723b4 SHA-256: ef1af9f33c65d17727cde8ce5df28889960bcdb725398718ea228d74ae8dde02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of techniques used to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://irlanc.ru/uplcv?utm_term=apk+photo+lab+pro PDF link annotation
    • http://familiegravesen.dk/userfiles/file/maxepisuxegom.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/wamapamubabesu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/ridipigofekuvakejufaf.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/64112128925.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/ranupiwugufujisimuvad.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/10234166549.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/raragiboxojurepa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/460ca41612ca579ba247cac1309a9026/reran.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/bevegotovipaba.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/58424577285.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/47431783440.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/48847659255.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090212555173499.pdfIn PDF document text
    • https://icbacademy.com/upload/files/47007797138.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/72528201391.pdfIn PDF document text
    • https://derfo.info/resimler/files/95361466718.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161355f42e49f4---99398132651.pdfIn PDF document text
    • https://bak.vn/upload/files/siwexibodijuzejibeti.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/buzafomonuwulanoxujodojo.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lifatobediti.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/68651793475.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/19004308848.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/96857136010.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/46627608944.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140618029f1a---toxesamibuzatel.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/34189034456.pdfIn PDF document text
    • 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_off0000be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE31 15560 bytes
SHA-256: 59486c099fb6ab025a35901a95523631542cc68eac0d9f7ffcee8ae782008ecb
font_01_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 10068 bytes
SHA-256: 3f4e8127894d408f429c36277513d619da3b4e8faa8b806e79339491fb86c1ac
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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