Malicious PDF — malware analysis report

Static analysis result for SHA-256 af56bd415996a509…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 17:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d14f27619ed1db176d075bb0cfb43318 SHA-1: 85142e3f3f03aed046db6dd24f21ebade69ad705 SHA-256: af56bd415996a509305993104a3d488f22eb24a6b992a31dc925b924920b4aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://watchimport.eu/userfiles/file/45884447382.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149836551b77---5321981118.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/sosajefot.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/42605017243.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bedetusenolokuma.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/41960280602.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/lokakupepumubav.pdfIn PDF document text
    • http://skomi.ru/img/files/file/komirelolobetukes.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/87808828650.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea2f0f3ee6---40167804424.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5a81d6ec807af1a7fcf9cc0194e3d38d/lorajezofapujajexoza.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/80059935560.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109080824002649.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/fosigagezaboxex.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/42517236470.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148776f0a8c8---wijegogezajapovotobusip.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/39597453108.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/ponugibupeweponab.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/32438993167.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/2503809541.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/zomudalupofikodil.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/bavomibudokenipot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+disable+javascript+in+tor+androidPDF 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_off0000aea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA5 16560 bytes
SHA-256: 6f9164c687e8f8f524049029eaca3458e357953113c37cf200f9d47dfaf82e34
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 10920 bytes
SHA-256: 3c62d18b34a7d67fb520404482aeb6ec2c874abb9a43fe39eec0a2d2a6445461
font_02_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1