Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f620e73ea46caa…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 12:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a0bac88f4a206c6e93114f50a9cf0bc SHA-1: a482f307849584bb34178c9a4c776649d607ec22 SHA-256: e6f620e73ea46caa67d97cb43d1cfa177292a779d2956696510fb6f8593a35c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://nic-n-nate.com/files/files/buzafakolepapesex.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/669ae8d8d320c52b69c72cfca9d11af5/93936718038.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/metojuvukoba.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/44757195299.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/sekekepu.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/dizozujaranom.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/lemexez.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/metob.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f9bac2f2---32686541685.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb30559f---65648679416.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jo9bggpr1nqrcr3af16sj8nd03/94853460402.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/1819943722.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/lomapesopajunag.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/92409672728.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/92816124502.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/82398146640.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/finimerebavamuni.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tphhpoa6jhbo53ir6gpt8212t4/72226446978.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6e079cffcad1478f3f5ac53c15bdcd8d/bilezupukexizewumu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/rokotegafopobifez.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160760dbb61053---69421091157.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/92794160097.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/vufawogerak.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/80981949170.pdfIn PDF document text
    • http://4bx.pl/public/file/46833659111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=a+knight+in+shining+suit+free+download+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_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 11036 bytes
SHA-256: 3a78590ec2dbf6d3e82f4589a0c4e851e86e9087b730248d412c62be567e368a
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 18256 bytes
SHA-256: 2efeee9f1a5b74cda3d2a828e6a8bc7ddffaa6fede6a0e3d69585b13e0446b85