Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed00c7d7da8cf4a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 12:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af5245209a1b76c7cdb642e6888ebfc4 SHA-1: 2b7f2fd2aa2b77924852f6c7031d5ad8e89223fe SHA-256: 0ed00c7d7da8cf4a263127e53e8a7c8277ac60d68a9dd33b79a632748a8ca017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The document also leverages a link farm strategy, pointing to multiple compromised or disposable hosting sites, indicating an attempt to obscure the ultimate malicious destination and evade detection. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ashioke.com/images/library/File/77816143993.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614039b88f33b---mifej.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62155658b---4389682855.pdfIn PDF document text
    • http://tochuchoinghi.org/files/wifivunasibutixepiranu.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/95998261039.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/vavukozozepanawutose.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/logosilowugidezaruro.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea82707fc---69342778184.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/tivinofune.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/87881269269.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemifukaba.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/solulirivanamisipirixowe.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/33287030607.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62f6bc196---robiginepitiv.pdfIn PDF document text
    • http://ifap.it/images/file/99759882760.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/wabunixifudo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kekasolonenuwi.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/32570062147.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/46097073119.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/71498954571.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sezivozapul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mark+manson+books+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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 18588 bytes
SHA-256: d2549a4792c53d673cc3d003452c236bcca925d70cdb304bd90665a6cd37d3e9
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 10516 bytes
SHA-256: 55d3a8f9799c52902ca424a0c6d86cb6afbb693d19d0a572c9dd15202bec2c2e