Malicious PDF — malware analysis report

Static analysis result for SHA-256 a469d700477340d2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 14:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa155c192f2bd9b8b9aa76b55ea1ec9e SHA-1: 60b31e9c0a6a6f93cee4b66cf096c46868d4797a SHA-256: a469d700477340d2d9e10db356fe52c252cdaf67b002347da508f81b7882d18a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farm characteristics suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://vinaconexmec.vn/uploads/news_file/bubezesanupetiwaleluw.pdf In PDF document text
    • http://kidsjeodo.com/images/files/dusoguxojibi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkmv3oo4prb0t56u3mdbm3q219/wiloma.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/71615868644.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/mokurewozimafov.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0e017124ac91eea8095f9f931d2376e0/74286245541.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/882bdfec94befaa9e0ca7b6f1768954a/zuserixapiwomesedokogux.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/47724229540.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400c817502c---74232195648.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/90366163286.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/2973857970.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/litapidimufa.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/77031682186.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/2868981202.pdfIn PDF document text
    • http://sjanzee.nl/file/gukaxinenilubugunumakalo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/41376868166.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/79935980329.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/xadiloxujezowarasiduv.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/94654190861.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef9821215---18328720714.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/wotexisedap.pdfIn PDF document text
    • http://rvhifi.cz/files/file/doterubilevirumogojolav.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/30927603647.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/60280023518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=samp+launcher+apkPDF 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_off0000c8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A1 10428 bytes
SHA-256: 59df19d64489abcd96b60c95e8fac44b18747d6d48fd320f1798debc61c3b7d4
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 19420 bytes
SHA-256: 997ff3dd01f57088a95fc25fa1cd2ba3b6aa88901549eac51b89c72eb7c55225
font_02_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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