Malicious PDF — malware analysis report

Static analysis result for SHA-256 88afbebca66d07ed…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 20:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a67ba4d6caf9ed6f7c9373cc0cf66918 SHA-1: 551643569f0a934f7354f04f3582aa121ac6b8e1 SHA-256: 88afbebca66d07ed498a8d9b98c74458123ce599d95a8698167b78f69e5cdf71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS upload storage or disposable hosting. The embedded JavaScript likely facilitates the redirection or payload delivery, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pagodatalk.com/_UploadFile/Images/file/latinejezapotepela.pdf In PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/95074017838.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nohggdifgudql81dlk8mhukr4m/wevuxigo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/20827491201.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nopaz.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/mivotakoxaxojulolu.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210907120025_1996313013.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/silupakowisuvedegexivig.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/31015507270.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/76267265832.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/89110332482.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/tatiwugujonatiki.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906021102.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/ziwofofijasilesotuzazov.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/wixul.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/sulel.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/gizijefuxana.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210905/16307756154621.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/97880884251.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386ae529e73---51100247451.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/414222903.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/31512804716.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/jetugarozusimo.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d883facbd8---67826438832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+autofill+passwordPDF 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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 10528 bytes
SHA-256: 2002bf2fc925b3a72426dbdf33793b72a3bfaae6b3ce190ae0c7da8b1f8c7b51
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 17940 bytes
SHA-256: 325040ce95ab6460529e51ed7160a2e97315c575000b9f38d3afa387321ce55e

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