Malicious PDF — malware analysis report

Static analysis result for SHA-256 9895c0fb094c4e2b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 09:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 606d204e25e9a999fb8d01ca614a6af7 SHA-1: f1e1914d7928a1c0d4e33296ba7ecfa3377fbb18 SHA-256: 9895c0fb094c4e2b490a2fab9e7fd8e664c68d1e9ef3f1ddade349033c1af7fe
164 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and ML classifiers, indicating a phishing or malware distribution intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=python+sphinx+html+to+pdf PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810cc8db16c---zowujabunofegobawo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/jezetu.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/49778617045.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/qvnfmakoh1gjc0sk882amt32j1/90706208981.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775aaa9b42c---11095084014.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/3890462224.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/lakakilirarufuluwutolu.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/44630217494.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a424653ab94---jerowebutepid.pdfIn PDF document text
    • http://chenruichem.com/upload/files/bekirukosoritufajufusup.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e68309e28e9---xifafevofejubepomasitapur.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7c7cb9c65d2c3e521e12cd1649bca4b9/74713082862.pdfIn PDF document text
    • http://clubchic.lv/c/i/files/bimajadafelebot.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/45468052524.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c51d103a7905762f26db1fb97f9c5ae7/46967889056.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/29542627891.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/tepal.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fazawabawo.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/41386371131.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/456f5e3d6d42e67127cad584c0056ede/85421631106.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/vapitifozoturow.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/48511839633.pdfIn PDF document text
    • https://inncredel.com/uploads/63842306105.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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 16012 bytes
SHA-256: a80293e1b18a62c3c5cfbaa855ab3ac2be4ffa351cdb1449f3def3a6008734e2
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 10588 bytes
SHA-256: 2998cc74a079c074b91150528d0872a76e8e738a1099488120e9624f476c6f3e

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