Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b706c7b9bce8745…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 14:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acc548715850d757c5d208cd3b2488e9 SHA-1: 07b8401d235da48488383ff3d52b713dd2fe65c7 SHA-256: 1b706c7b9bce8745c6ebf34b3af98e8e002c521dfa4a90b9a10f9ca1c0f3a829
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and the nature of the heuristics indicate a likely phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://newbusan.net/FileData/ckfinder/files/20210909_667EEDAE4350418A.pdf In PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/12215507810.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/37507834830.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7cb114d5eac9235351896338aaea9867/kafukosajefoluxawijuw.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/64237695304.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f7aa3644e7f87b2cecf75cc7fff300fa/91388204554.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/17283232807.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/6823109191.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/5171850132.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d50e896ca---wuzegelibaxuzuwatob.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/51896740668.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1e9c0dda---83855590639.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/39758480993.pdfIn PDF document text
    • https://europartner2.pl/uploads/20770525957.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/gidobokerufefasiv.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/dubapipakakefadov.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/pasakomiruburunuxenudoz.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109140605301267.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/99572748988.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/68680199535.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/25132998847.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/65277277966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wendy+shay+new+songPDF 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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 10384 bytes
SHA-256: 21af88d134f1e199e02eb18d48354eaa6fbcfdf0a48c789296bb0397bdfdacfc
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 18620 bytes
SHA-256: 8deec6ddea7193d6d10497c4ba6432989c31ea478894b0fbcc5041e05573bd16
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.