Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ddbf75cabae506…

MALICIOUS

PDF

101.3 KB Created: 2021-08-17 06:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a14d596297dc78a1eb4a71eeaf7edae8 SHA-1: 2d7ca9de571220768d27bb747ef88f1f15370180 SHA-256: 83ddbf75cabae50624c0ed6cfc7ae3120db02e827b773b138ea0510dd114ed73
164 Risk Score

Malware Insights

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

The sample is a malicious PDF containing embedded JavaScript, which is likely used to exploit vulnerabilities or redirect the user to malicious sites. The PDF also functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+build+a+schedule+in+excel PDF link annotation
    • https://audit-advisers.com/userfiles/file/92269649657.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/22hrcasdo2bsnd1pc3g8ird9an/91499981372.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/modipadadonazuvub.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/tikesarala.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/gonutobariromiwugokazid.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c6def8d04695792219d5cb497ebb03b1/8611061326.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bedofotasasanuti.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/niloxena.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c8818bdc371c3bf443e684ad9e42a8b2/sezejenotogem.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/16811627147.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/25a0c01e08611c1a4c18eaa378d9dd44/fakitiwezodudobipeva.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/37262779508.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1467c5bafc40c64da67fd28f335b2838/70665341488.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/sotanibiririmo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/godibomesubefulon.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/tapokeferefu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ac59f700---kopagulimepe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7969cb3b03---71613724675.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/81561786656.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9c0eced6---14218689315.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d178628df1---75810298589.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7e60a4f721cb2be3fc4c1365461585af/viruzubonozavobe.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/mafateragemu.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_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 16988 bytes
SHA-256: 58e050250b0d68b7abea82bd3965cd435bfc4fd3a59fc085338d5d535a2ee606
font_02_sfnt_off00016d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0C 10788 bytes
SHA-256: 9e82d27b871a18e51c3b6ecc4b4bb2492a36d0677b887c692bdefabfa86520aa

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