Malicious PDF — malware analysis report

Static analysis result for SHA-256 df95107cf1d7bf00…

MALICIOUS

PDF

95.6 KB Created: 2021-07-14 03:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65de5c6d352e910ff108dd5749d49ca5 SHA-1: 9469eb1818d76e608de618372f16a560b6aa1f88 SHA-256: df95107cf1d7bf0098a0b1688383fae42e0fcb56d580167ba168da7a6534c262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting services, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ce7cac89ad01688c29883f0841b303c1/85676061543.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b60eb3604ec1b36143e1aa5f71e58f7/tamepu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/65214889628.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/vaxakawiluletowejopo.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/38145581353.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/seeea454n4hmaoafa17cuj0227/vetixejodaf.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/sibom.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/nonalepuwotinopuwakaki.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1626097121.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/pewoga.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/fupiret.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84345dcc8---83124539417.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f279a085---madisegex.pdfIn PDF document text
    • http://mlight.cz/archiv/file/83843174523.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/20218165795.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1576616ed79e96e237c6f24a1081ca99/kijozarediragezebolimuti.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e85a28fba---xetumowanevilog.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5222bd89d3c84c75a1bade540a08efa3/53453929036.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/fbe0b2409b434da343043f96fc3fb791/99638307794.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8ugn3elfkn0igtt99t768kveqt/nelipamekepow.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160758e0b0ef16---wiralexotavanominuwe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbd113780---gotoramojodoliwe.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/11609106136.pdfIn PDF document text
    • http://aquatherm-graz.at/files/91638522580.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/96882375036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=words+from+letters+middlePDF link annotation
    • 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_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 17476 bytes
SHA-256: 42a68822777b2084f370df5b136522d01d475f7a590cd624c2f98beb793838d9
font_02_sfnt_off00015a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A55 10240 bytes
SHA-256: a8ddc32f22be67157cf34456a7f9b0f3b017c7542973f4c712a63e021b945587