Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c5fe2b20e847a9…

MALICIOUS

PDF

117.2 KB Created: 2021-05-21 03:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4fac774958a8d39a10fc184e2882cb5a SHA-1: 5bef350abe7f6a7fd0b3d9f6baadba506b5e280d SHA-256: 45c5fe2b20e847a9a57b3d981597dfbc41e0d25eb68e5bd3fd7f46cc076306d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure disguised as a 'Seventh day adventist xhosa hymn book'. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dohluhgt1gvdk6jvocv4uoqrm1/13369735325.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc8c187a3---26777165563.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609962f34032a---mumigavodiziramutakega.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58fbece09b82ee7696a60dc9954e5885/xizavevot.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607513ac0d736---2564303490.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5h1mlgrdm9rqm083tjhs48l4mu/85430258426.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/30f44fd0d86c41acb1f3277f7d71c473/sakejomikoji.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/15352499962.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b269efce2f0ea2e34771a8390099ceb4/lonuvawufer.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb604f0eb0---95456133481.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160963692cdc1c---61778237570.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sgbqn252nt22nj57bmd9799im3/figebamadufuludalel.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/db09a9eafac49ca7f5c260521db40053/644419660.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file/%5C/vutejigobovirilapokogalik.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ef9094f9573acaf26ead8717f4cef722/dikolotusukunofod.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f507dbde4---81239938367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=seventh+day+adventist+xhosa+hymn+bookPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18511 5476 bytes
SHA-256: 735746799e1843c7b866dc12c67f870d207fd90c45706fd6ee24ec9b714f5926
font_01_sfnt_off00019792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19792 2024 bytes
SHA-256: dc37461816ec92f0ed1316601fd5c6b06f5c1a5be203c138b3c3c6cdf5da3806
font_02_sfnt_off0001a12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A12A 11076 bytes
SHA-256: 66a1bed3ae5b29bf418ae606e3a6877f4c2beaad450696494c22bad7d4cab33a

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