Malicious PDF — malware analysis report

Static analysis result for SHA-256 c015097afc0a54c4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 01:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf99dc0b0335259936815619abdfb3b7 SHA-1: 8ca37bcac277ffb8174a90a1a97170b8e6a0b9c0 SHA-256: c015097afc0a54c4bea0415022f13f7df1bffbc2f212bd3b0fed7b071ac411f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://archism.ru/uplcv?utm_term=sentence+about+affect PDF link annotation
    • http://ilovemynewstemcells.com/clients/865932/File/32947737340.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/xizufavuxade.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/bodanoj.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/b3546f81d809b7cf927cfbd87533efe4/bodanoguwanuwepexurus.pdfIn PDF document text
    • http://poorclarescork.ie/images/labozuras.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d321d2ed5---29795648969.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/mobuzefajibokutadetabawe.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d3a3412c---83565313718.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5d791800---6352233830.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ab3c67c8cb9c50e91adba87c6f9c4940/fukusitadeziparixodata.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/68790360472.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa52281a4---xagibevar.pdfIn PDF document text
    • http://makaroma.fr/upload/file/42533811230.pdfIn PDF document text
    • http://waterreducer.cn/d/files/12529816326.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xufuvete.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/24700546250.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5b58bcb15---wutos.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6021b3f49e---durajobonabozozifadugofib.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3068bb5b7---fejazozemapetonatujuraru.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d3225c2a172ae76d3d06513e67d452b2/93628664959.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/46998596499.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fc6f1affa601a45af41a1e8578b2e8cc/56779818099.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/dixurifuxokitarapozovuwav.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wozirakeberizu.pdfIn PDF document text
    • 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_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 10240 bytes
SHA-256: 27a69472499a33ddcc6f2060de515a43fdee5dc4ee33540846e2e97a9a30d99d
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 17716 bytes
SHA-256: 40fad64faa345fbadcc0269b32af7b9b09e518f24ebdd49ce17ba874cbc4100c
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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