Malicious PDF — malware analysis report

Static analysis result for SHA-256 87653fdd5eeab444…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 13:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f5f4d012c1bb712ce1249821896ec87 SHA-1: a065ed768b084e16c4d097f81a10f0728dbcfd42 SHA-256: 87653fdd5eeab44409c9fbdc05291a3e2a55b8651bc307acd2b8ea87ad2495af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stark-tools.ru/images/uploaded/vinelexesemafulanaranaja.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d469568d12---firanatixeluzabak.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765b529993---kawovewararo.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/karov.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210817130734.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/parefasafa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14081d20f---80924409011.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kpas5ksahk08hkomblgeee8jvi/regikalazov.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/maporikabuzajuzew.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/93fd8e1f10ffc939021ff390ef152e95/26802354935.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c3dbd5920f0c59449029038f86a134b8/49211801228.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/voxeposoba.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2ma4cv98ee6r554ta9jjbu34p/dedekisadaro.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/29cf1544968976abb32c87f04be6c366/xabubikajuvaroji.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c9889354e5c66b680c21d309ba00e5bf/48292140247.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/6169703226.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kakuzufazejumazebu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506160839261008.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/funumov.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fixopon.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/duwelazudapun.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1aef5bf4dd---35295754214.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210803225527.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/03b71d0ed3f3980b1bcc0f96ad3f57e7/16681549716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=disgaea+5+complete+guide+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_off0000bf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 17016 bytes
SHA-256: df1112d5cc4e93793668e93350c22f548a218ade4040373343923e943b06ddc3
font_01_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 10996 bytes
SHA-256: adf6751bc4c73db018caaba3eec246880c79c05cdb1e65d00a22b67179c40584
font_02_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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