Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53f3d30370b9970…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 15:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32206c8e47f0233301d65c997e045f6e SHA-1: 5c4d633c5d183247a0207cbd2bd2b95b4211058e SHA-256: a53f3d30370b997048d3eac41d08e5df1d71c9f84af5f51805fda621870224f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is designed as a link farm on disposable hosting, likely to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=surah+rehman+with+urdu+translation+download+pdf PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1b404286074931c8945510993b039a18/33997380680.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3qtth8nmoe7qu6odd11if7e2c5/zurekosuna.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/910dce54c1dc18552ebe2544fd769edc/95677757278.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ad44e9045ca0609c36cf5ac2a38bf7d5/72617917831.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa4a97ac6---46412444837.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/78926436191.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/nja3k036a2tpok5n9qj6dttl76/lulabumufelutajo.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/61333693450.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/lojawede.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/fimowujipodenupajujinur.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/dowomujurubazem.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zunigowimifuvekizuli.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/75200919782.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/22045449215.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/xusanaduvuki.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/mawokexixuxipolovafojitul.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bc084f4a---40036188750.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062606045078.pdfIn PDF document text
    • http://hydrem.ru/images/file/werakedexima.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/111ebee4b965505f08b85ca9f227de59/jewifukixozulewimavebup.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/monudakojomakimodaguwug.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebd3aa127---89820857894.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 11024 bytes
SHA-256: e825f3fc70d938fbe7049c0b958b339b1e465234e5976ef0977a42ca77030c51
font_01_sfnt_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 18068 bytes
SHA-256: 04a1992aa678e541a361833b06281872c4c3132be40ccd7692add11a1ebfa7eb

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