Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e578174623827c5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 18:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 981fa9945c421d68e7f3605389815377 SHA-1: d8b7e0122f573e3adebc9c4363f6cbf34fbc69cc SHA-256: 6e578174623827c5ab0d9f5c9999d136f8c2451163b784b703ed56683bcfc6de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. This suggests an attempt to lure users to external sites for phishing or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/64388baf9a37944bd72e49f3d8266d83/211414608.pdf In PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bexezujar.pdfIn PDF document text
    • https://tch.lu/files/files/88186851617.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xofiw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130365708fd8.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/24608268445.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/41971642055.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/sevipelobezatomipo.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/53355989609.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/zixabimapil.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/8294878003.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/98723664817.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/rinazazigil.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/48690204515.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/92364016607.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/13830058962.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nolego.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nitenupe.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/63070663531.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/zofirogowivujusuva.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/wunuwuzudotofakonomaj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bpq9c29p0t0olgn9n3iojlipko/jugakevusofelikelawabori.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/dolotosakogomixofogowewev.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613028813e48a---40365544432.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/69137962357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=relife+manga+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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10400 bytes
SHA-256: ab465d9385118a556dd9bf24358a97b2b17c451d26678eec2292c5492453771f
font_01_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 19148 bytes
SHA-256: 8c464403d7a54610f379282577f4f2a9aa8131c4e13c939581421d8cf3f185f3