Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d838d6c64a0335…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 14:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5085db366fd72ad16c3c51c7773c433 SHA-1: 81497b70c5b2f2917906902eb05fcdadc9eff4cb SHA-256: c2d838d6c64a03351d02fff9539626a72dbb70210b7719566221da4e2ae1a27c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=injector+ios+ml PDF link annotation
    • http://xn--m1age8bh.xn--p1ai/files/file/71861668367.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zetojalomudowem.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632732364.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3868bf5f58a28fee7c5fbe63d61b2337/naxekiwebufovusuli.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/59509644269.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/98645033110.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/tevusesiwavoluligupol.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/pijaledo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pobaliwuvopalazepe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8906483d9---tebotexipawepomofuxata.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/xukoruzemetaw.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/71886643632.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45561897986.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/wiwimezidenotiviripumi.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/nejusab.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/mazemu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/41228103931.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/zeduzat.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/tazuwug.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615410ecc112f---68194964117.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/vovajugovenepu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af3c36175a---82104222382.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/20487018722.pdfIn PDF document text
    • http://splogservice.ru/content/files/dovugolivobikusepuvogevil.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_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 10312 bytes
SHA-256: 24829f78d7303ef150cccde9f017ba6ea377ce8c18aac6688df502901d21861d
font_02_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 14892 bytes
SHA-256: 640058054f4106d30657b8e833d1ee96da39d6afce0452c064b68942c2bbafb5

Open this report in the interactive analyzer, or submit your own file for analysis.