Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b86ddb5a2598bb…

MALICIOUS

PDF

77.8 KB Created: 2021-07-10 13:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c947541a573bd3a7ab56ebf79ab15028 SHA-1: ced5151d951f51ed8e8f0cce214fa6e8ed0bac20 SHA-256: 54b86ddb5a2598bbb00c3a3249276f9a6fbeede60a7797f31bbad9a58942014d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3603e10306c7f3996d331ee881f63eb7/56993686198.pdf In PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/vebizegisu.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/legurinopasur.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c337426174c---39032241196.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a8f59a77---wopope.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08d229c10---1639741685.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zuxasetilowoberedesezavo.pdfIn PDF document text
    • http://stylekd.ru/files/6898098445.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/v0s27j9ik7ph5kqljdfalm2du9/sifefe.pdfIn PDF document text
    • http://apvn.info/userfiles/file/93955202075.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cd7394cb0cc71c02ed5a439115a40e08/dokoxovejelilitapazekeka.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/puzutobim.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/24958884018.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/82676508541.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/vogoxolewalelidekoze.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2be91becb---lisageteva.pdfIn PDF document text
    • http://4bx.pl/public/file/586700545.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kesutefexo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/67m0m2n3thq4oeavqjg7gos0jo/4334391844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=storage+and+file+structure+in+dbms+pdfPDF 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_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 15708 bytes
SHA-256: c99e214f059cdbc2f2f9858f4ea6b84d2ff16d86c7d48beab95bce34ad83dc62
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 11280 bytes
SHA-256: 1c68e74b6ec81e50c67298785b08c110b35c0cfc22ad0c931bc35436c34f5a84