Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6187110d1b1f43…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 12:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 494620848e4c1b2461faa20640726203 SHA-1: 3f82ed6a7dd12ddd6be06c1ccb81bc85e3af8504 SHA-256: 2c6187110d1b1f43fdb04ac9a940eb874e1d47a4eac06833fc803b81a27db0ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable hosting sites. The presence of numerous URLs, many pointing to PDF files on various domains, supports the conclusion that this document is designed to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://timeyear-v.com/userfiles/file/61074805448.pdf In PDF document text
    • https://dalycity.com/wysiwygfiles/file/45719738088.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/62995749172.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161347863a23f8---xanusodilijebabepatuwi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/lixokojuzinof.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mhlm83aep2f86l18u96s62rf9s/fudixibarixepuwu.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vulemabapo.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/85554285066.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/delisivegixogefega.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/zataki.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/73527794037.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/mepidavexetibewokurax.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/92177906724.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68308148167.pdfIn PDF document text
    • http://zimmerei-possert.at/63826938070.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/34206208446.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/29158515690.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5e6da5eb---14878784991.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/48505387271.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/95511447579.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/57902231744.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/xelogoderivuparofobax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=java+editor+for+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_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 10188 bytes
SHA-256: 66bb0c926d15e52af1b010fc513bb662aad4e1c9d2a49d607be6569a15722c2b
font_02_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 17492 bytes
SHA-256: 931415e4e7576ce7e6b4adda38a440dab793d3935bc9dbdedcb292090b7a2815