Malicious PDF — malware analysis report

Static analysis result for SHA-256 10601321e946c560…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 19:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2204127d998b836859f75c3307087058 SHA-1: 4660c9fbcee9db2b1cfd341f89c68935d8d09479 SHA-256: 10601321e946c560dfcade60c8b7d2661e1a833561de3690450358e58869feda
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan signature. It employs an image-based lure, typical of phishing attacks, to trick users into clicking on embedded links. The document contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content or further stages of an attack. Embedded JavaScript streams are also present, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=in+order+to+use+mock+location+allow+mock+locations+to+check+it PDF link annotation
    • http://jcnjl.com/userfiles/files/76070983476.pdfIn PDF document text
    • http://parafiasadkowice.pl/pliki/zikuti.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/jatimotipolikalorolewezel.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/36126873826.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/43454997273.pdfIn PDF document text
    • https://fasaac.org/temp/files/62083414650.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/84718322331.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/20718768418.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/35385565583.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/28939637415.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/zorixifuvegejimixemanaga.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/86132717732.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec6f3b0a98---nudiliposajusuwevizak.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/wajax.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/99232537c48036f211d935f82ce986dd/madixavuzemi.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/safufozisizeput.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/43094045044.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/jajazarojanemo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e21b4e051---pigikapu.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/zubosatub.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/dotadekux.pdfIn PDF document text
    • http://skupka23.ru/upload/m/58185604308.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/vosodugowewizibolem.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/farabun.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_off0000adfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 13944 bytes
SHA-256: b7b35c225d8d2c211f6d571c2efbf0d480462c60af10b570b0d82878ca3e254d
font_01_sfnt_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 10864 bytes
SHA-256: 90eab84278a08e98c2c7bb62c1143e1abd167a7008e718228c5716014d7f65dc
font_02_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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