Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed8913b88693d60…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 12:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36a5e95e1ff9190150e6fd1fd30305f9 SHA-1: e30e1f280b2be89ad52e5fdcfd77d745de899489 SHA-256: aed8913b88693d6038c8e1842b4c43e11cb7d5117da35c95dca3f233aa96098a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, including one with a 'genshin impact' UTM term, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=genshin+impact+redmi+note+8 PDF link annotation
    • http://dunakeszi.varosom.hu/userfiles/files/pilewetas.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/15800489754.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/50590386984.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/bivedamevupesonibaliba.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/pojudepinokuzekil.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/zakotuxazagufobuvugo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9156a290f0e54e0cbad1785b131cafe2/pelurareja.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d71969e8---nebexeve.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/selojixomunapitukafem.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/15883507420.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9d7b48f4---pixapamulewom.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364bae8a2c5---xopokokadidumamipuzereve.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/wobebetumawobosipuzobaz.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/tadalik.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109060930567443.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/fq4rgr8cisg1brdeqquairdlor/zipusubek.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/gikiwoxekizedifisekeves.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/zidagadifijikivotuzapi.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/mujedasipozobukipibes.pdfIn PDF document text
    • https://flyags.com/editorResources/file///23277102926.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/58751009918.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/63383612292.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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 17456 bytes
SHA-256: bbf0af535973f2c1d567d49c05dc286e27e2c7a0caf6e9055ced32f8cd292e97
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 10980 bytes
SHA-256: 7d3c63a5c3e9fc6c1747167bc2f747cef58c5b36351534046ea56ec225a4f35c
font_02_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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