Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1d2bafa54eb1ee…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 18:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e0ac8291439657a76ee571be71af9c3 SHA-1: 904633bbb23596836850d2b6fe225c812cfa8341 SHA-256: df1d2bafa54eb1ee9f0ee6b31ec16f99e5c09a4e9539762e315d62cbc37a884d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://maekuangudomthara.com/ckfinder/userfiles/files/kekisutojola.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161369c6d3c37e---81200433313.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/vakexudasekebizej.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/soforulax.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gunive.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/74288402008.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/58359742225.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/sapijep.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fohf0t7sm509vebpotq7cnjio7/gunuvepu.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/zenojubon.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/banebutexageme.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f4036f4a---fowozajigop.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/29460321309.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/sunedebesakigibofo.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/kawuvudujuvulebogebudirip.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wuvozibekigunubagez.pdfIn PDF document text
    • https://schmitz.cz/res/file/bexijuzujipasexuxuluwana.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tomifom.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/tomitakek.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/wosetor.pdfIn PDF document text
    • https://people11people.com/uploads/File/vunusawufipelo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/2740049429.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/76842702346.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/13349476726.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/befapuziz.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pojeserova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=deezer+hacked+apkPDF 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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 17468 bytes
SHA-256: b44af4330417b4ebc3978bf8f653aa141e9862917b475e48806f89f1e26a9aab
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10136 bytes
SHA-256: ad66e5506836ad2f6c68e592230b7094640acb42ae64fa746cf2d5405c1851bf
font_02_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1