Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45208f5f91d0e19…

MALICIOUS

PDF

81.1 KB Created: 2021-10-05 22:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3749a9d4ef49c0155347a42beee8cf4 SHA-1: f3aa760684c5d047d6b47afc3e0445c365c9161f SHA-256: f45208f5f91d0e19bea31131aee408c73f73f1a118d8d16c11f4d97db0030917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=honesty+the+truth+about+lies PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/04fd126d5f9d1e8c44f8caaaf16f7873/18337609108.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161587c01a523a---sajupumogiku.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/43101677229.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202110050837046276.pdfIn PDF document text
    • http://htygroup.com/upload/files/lojezotilinesaru.pdfIn PDF document text
    • https://service-panev.com/userfiles/13085610716.pdfIn PDF document text
    • http://meditopthailand.com/file/kokatoremopuwefoko.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210906111132.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/65809410830.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wunejagazetu.pdfIn PDF document text
    • https://geniodelweb.com/file/10404880336.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/42955606451.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a4a46010---66767036877.pdfIn PDF document text
    • http://nfc.soo.jp/file/gidanigexu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a208ba592e69da76406aff3fea10378d/siwutonusoruvuzogenif.pdfIn PDF document text
    • https://fasleh.net/Files/files/54457284822.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73852002811.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8e42cf0d---kugigipimopuromuwono.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/96683670054.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c773ae24b---kopapojamuja.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_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 18920 bytes
SHA-256: 8619dfdfa90328a6ae18e17fe8dcb9e4e5a164d902b2a3a7463b87ebf783fc6e
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10552 bytes
SHA-256: 390924ab04f99c55c9cf37e8e8b6bf0d835715380f24b14d3bf707d8e073f047
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1