Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19f4b169e01a4f4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 07:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aceaf19de7c744180d0421fa49735406 SHA-1: 70b43bb463899c75e421957d1b039c876b2e1f18 SHA-256: f19f4b169e01a4f4240dbc62b00963c638e3ae13904d4999c351334492d97652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5006cc7fd---17768516002.pdf In PDF document text
    • https://asset-books.com/userfiles/file/94732123439.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/nipowojida.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/peletubu.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/77375239444.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gupovizukasemugo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/90190363417.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/60876439522.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3e760ba0d4913a89945805f29762d667/52039605111.pdfIn PDF document text
    • http://bronia.org/userfiles/file/foniwatifejetusi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/74797374827.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e5d055b40478c036bb05de67ce9b6306/vabenutasu.pdfIn PDF document text
    • http://z500.si/files/83420243859.pdfIn PDF document text
    • http://husplaza.hu/editor_up/63510070939.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaee7ce554---56149885104.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/61191244656.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/afd0ff305f2907d70382ac51bf031c1d/93020308226.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//52139183556.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/xuzekavoxased.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/51677034617.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/11220554322.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/73612894375.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/23b94bbf2d731e098211a57ae5cc6325/90234975209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=faster+than+lightning+my+autobiography+free+pdfPDF 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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 11276 bytes
SHA-256: f5060cc6e9556e741ba06b609c17beaaa1de2f7411ee54649ca6b7b374c08c7c
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 17952 bytes
SHA-256: 30cbcfaf802dbedf81df6166095a07c9f2b0d1b4e1e027e6d5388e052c8e1bc6
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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