Malicious PDF — malware analysis report

Static analysis result for SHA-256 e552f2241fef9c42…

MALICIOUS

PDF

80.0 KB Created: 2021-08-25 03:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6208c672533a26f6baae41c9e6456fe SHA-1: 349c2f5caebfefd0f27f20e3093b548744dfefdc SHA-256: e552f2241fef9c4283ea8c5c27e3b55ee449c4ee5a0e9f4cb277b0cd112bba57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it acts as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=what+makes+yellow+and+blue PDF link annotation
    • http://tasarimak.com/ckfinder/userfiles/files/sivugode.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/likeseroteluxafalinod.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1abf48dbf7dd3776e4e31d8120df9aa1/mekur.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160867dc01c48d---fesiwemepa.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/rebukif.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/48656569744.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160956dea68ef9---74264421648.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e332a517b51---kuwokomuzuvi.pdfIn PDF document text
    • http://charontrade.hu/data/file/suzexuvekagon.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af7553ee70d---zozudafumutol.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bnba5has97jnio9dis3iuo3cff/talisubofovulapixezirilo.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/fuziviralogo.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/boned.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/3706613645.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/nemurufokupigona.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/51859847790.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/37899605299.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/39277096621.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/69911754397.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/fawenuke.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/militij.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e00d73642---goniliso.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/33779350716.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/60107462506.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/5269835005.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 16164 bytes
SHA-256: 075452adc8307ffa14e1fee8f1bb1cc60e980ece1724d9b6edb3670fadaee7cb
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 10848 bytes
SHA-256: 3b4b781701b95a2a395831c29ec8ad404d8419ceaeaac770c6344f22cac8305a