Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b730d9de07559b9…

MALICIOUS

PDF

92.0 KB Created: 2021-07-03 14:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10b100552fecab9961656c7ea976c0f0 SHA-1: 17db998cdd507c182c91772693e44e81a3f15a4c SHA-256: 3b730d9de07559b90ed6446809b7c9bfa4921940c1c57844fe785f01ea539ab7
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains instructions to disable security software, a common tactic to facilitate further malicious activity. Multiple URLs are present, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://smidgel.ru/uplcv?utm_term=miracle+box+without+box+crack PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a05b8678d59647ad2dce4dbcc3ccf95e/3675454973.pdfIn PDF document text
    • https://khanikango.in/file/mafipofofetumobetib.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/55118005880.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a1868732ce58347503a7b8de3c1b3d4a/33605085966.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825a13c95c8---welut.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vtgo1eck18dqbk21abfdugrlr1/53038828484.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/82710371778.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/kipowikifefag.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/toxojamoxogatefuluxopupe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6371f2428b---41420976384.pdfIn PDF document text
    • http://grupophi.es/uploads/files/57029074226.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceed3d5519---20932789635.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609651502f786---tipob.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d20b673a213c775bb13e4b78887c8df0/23021522903.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/87415933174.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105021114247293.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/35104355683.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/36531372806.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/52425701080.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/44544889594.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/31724756549.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/48320569291.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10568 bytes
SHA-256: 67b5037202af78c50d17947b882eb9f1f510dc8abc79b755f34a750db1514411
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 17164 bytes
SHA-256: 4d2026530799885b360489f776e6a415e2495674a9281d6fba4ec58416bca09f
font_03_sfnt_off000148c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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