Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fce67992a2d217…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 12:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e97e086d5d4c07fd3c28bd7e5e02303 SHA-1: 10ba4cb6daeeb76e0c99b8d0d4173d9ae7a35fe9 SHA-256: 41fce67992a2d217aa220608aa3901b39255344c9ac2b5b330623c831a71e0b8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, are part of a pattern to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://motoralbini.it/files/file/romewiwufoxujenokeguze.pdf In PDF document text
    • https://stratasphere.online/userfiles/file/zidimolumigibuguxerujoziw.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/33689020733.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/sifixivalelogatubofexi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/xuxix.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/41305569994.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d3cb4434---watawapolokazisabuzutosox.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/86666758922.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/40568262538.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/rivutamosasulopilan.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/37415807325.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/xivaza.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/ruvezu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133867735189---zojubedivu.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/gusameligizijudagijujofol.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a91b09dc---rugoxezumumujuwoki.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109061045198485.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/83734688098.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/xudokojinilimuwer.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/61734639762.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/lanugerapokigat.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/42226041404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=star+movie+app+downloadPDF 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_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 10612 bytes
SHA-256: 17cb657934bf84af5a8d96edb35d90769b1310428c4993b2b7a34d820ce82525
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 18580 bytes
SHA-256: 63d52bfdf822c1cafd7fedda0c4894e543c4905f3183d2c223d80fee726162cc