Malicious PDF — malware analysis report

Static analysis result for SHA-256 84820d91665e2427…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 04:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96c3582dbd53ade2820d1a07bbbb82ec SHA-1: 67b630ff8e23c2c760917b7dce80951c8311b292 SHA-256: 84820d91665e2427e466932d6e70ddaf46332d6d2015e335d2128a659f453ce4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=last+survivor+diaries+mod+apk PDF link annotation
    • http://nhagiatxanh.com/public/default/ckeditor/files/pomajodebixosazi.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/3717944878.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/48a61e2c3a7b02fcb7a953a128344231/45207275972.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/65358221790.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/25843104492.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/84223288317.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138131938215---wejuguf.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210912_E1E58A5DE9ABA445.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/wopewanufofediku.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/62016916529.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/92710519404.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/61508423133.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/givuxejejawesexodubomes.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/46697dc9bed9255991ecef878c8aeb03/48672098471.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/milugewaze.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/gozej.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/firewevapopulopan.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/25094310585.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161310d1153fb7---40908424417.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/xajopovakumazoda.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210910134416.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zokasetitosogosuwizaduti.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vomizaluka.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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 10620 bytes
SHA-256: f124947ea5b021375c75ea77bf1b5cec83502189c55689d543cf1cf71f6b8788
font_02_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16968 bytes
SHA-256: 1916493e93ab842d1dbdee6700461b6b2e2cf10d481575f27bf0e73531275dd7

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