Malicious PDF — malware analysis report

Static analysis result for SHA-256 722e7bdf5c6db229…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 14:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 363c6a2b1614491c56386b4ea56d4940 SHA-1: 0a59bb1a19f2bb421e06c36ede6e23c02dbf2f8f SHA-256: 722e7bdf5c6db22969591970b0f0e75f94f4e411a4a61ff49c725ef730eefa0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=mustafa+mod+apk PDF link annotation
    • https://lotte-ppta.com/beta/assets/file/20029918071.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/bixevar.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/20635038358.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/doposizuz.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/dogatozonesijinuzunega.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/rexosizokanafomamisakana.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2rosqmmff7u7pajtteoaguvi7n/gesefesedusuwi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3977578c4be41b2c3fa886be4472bcc6/16721279916.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/56208836452.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jonuwujikamififil.pdfIn PDF document text
    • http://njxinbell.com/upload/files/39654616174.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/76064546374.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109061650388617.pdfIn PDF document text
    • https://educhina.mn/editor/files/67167579081.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/15945276260.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379e0e27383---82813248347.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/kodezifomadelebo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ee5aac915edfe5afd4185ef7879b3b97/pafasatuzeg.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7dcbfbc10053de1fbf590d47acef0c5c/juzawakeginajevedol.pdfIn PDF document text
    • http://sql110.com/pic/xuwurev.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/tadufimiwape.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/36150271565.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_off0000accd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E4 10368 bytes
SHA-256: 6c678d33c5f6eb1a54ac434f11c2ffe8994100a84f67ccdd99fd0739c14cefa7
font_02_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 15864 bytes
SHA-256: 670b65ac9187a28f65f4d5ff47b81718bcb431b878732ad1d16c219e2470f157