Malicious PDF — malware analysis report

Static analysis result for SHA-256 93dcd53459788726…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 09:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a760da5a3d6457ff88a48553019892c SHA-1: 5b86525970a6d971f27cdb0861255754b1327425 SHA-256: 93dcd53459788726f52ef3cd27083bac3448957f428fccd2b4429a868f395976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links strongly implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://elfast.ru/userfiles/file/xigawebenerib.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146f19057dcd---73347277222.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/31489965787.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/kexakowujurebux.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/53605880114.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/3776435518.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaba9b9bc---18001355719.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/wuwiwujixepelejetamijosor.pdfIn PDF document text
    • https://ubranni.com/uploader/files/womifamafazivifuvevuwora.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/sezegedulujewaxudu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b0646485d09731189272ae855707dd67/24318072601.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/risidepizefisipawo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f92c4be752819ed5c7a7a6a1f7a7800a/gekupevasanumujupopilel.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/pifale.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/5406266001.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sr00dl9r7a3vfvia29f9dg079m/lulorazewoxopokukano.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5ea9df79aa8b222bbf6dd09ae62ced63/53192769105.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b11e6ef04e---xatogujorazo.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/vunozalizomijigelew.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/88891072323.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/25b087d9766c101eaa9456928943f642/xadezudulepogizi.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/lulebifavewelutovasipi.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/90887597788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=skill+set+1+student%27s+book+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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 18784 bytes
SHA-256: d11df1b9cdd30f2f1201f17288db07475819c157d081e6d161f415d4d3c44be3
font_01_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 10724 bytes
SHA-256: fea4215f62d1679826ce4087fc782c4cc021482a37aa052d4734d58d1d73c9f4
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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