Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52be6d01978291b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 12:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57d6482a80fd8fd0fbbbb567d93bdac7 SHA-1: 80d5bf21ea553b5c520b81e419a3133d3d9e8852 SHA-256: e52be6d01978291b02795ec7860a02eba301698612bd0d4358bbb99cf1ecb67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c50b01ee8c---91902338906.pdf In PDF document text
    • http://shopabrang.com/images/files/36627241299.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/32007716348.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/73809524645.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/70604359142.pdfIn PDF document text
    • http://oris-am.com/editor_up/86751755806.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/89559527742.pdfIn PDF document text
    • http://craj-ops.craj.cz/soubory/11118628391.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/rezumarifajibupiv.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/sotajelapefolutul.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/42435170085.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/gejipirevigiravukonatiros.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/fagonawidemexi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/e810o31bmdhkh0s9dshtbodbn0/renoxuzajav.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/216510552.pdfIn PDF document text
    • https://cncunse.com/d/files/limel.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/tidonoma.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/42454059447.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/rimirowabifijewuju.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/regoxatelikexa.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/voxamamapinodiz.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/goxodupir.pdfIn PDF document text
    • http://honda-vo.com/upload/file/77531286140.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161332071bdc0b---63532560412.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/7321423148.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f730bef578---98979686751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=top+story+based+games+for+androidPDF 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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 16744 bytes
SHA-256: 2429ea77218c265d18b70bd3dbb36014ab29a32eb1e86c15e58a7961a85a7aca
font_01_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 11012 bytes
SHA-256: 5f19550651392e83ac408a618305ae38815b5fd7a0b23d2fa51310e425db0dc1
font_02_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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