Malicious PDF — malware analysis report

Static analysis result for SHA-256 5044576275d47fda…

MALICIOUS

PDF

86.7 KB Created: 2021-07-27 04:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b069428f5364e5acbccf824f0a28d8d SHA-1: a5d32fcbd6e174bd2f5254a9e0c09fdeab1310c0 SHA-256: 5044576275d47fda974510b446905f3fa0668d856468eda47dfb2a4f1df50f34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to URLs hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of link farms and compromised CMS uploads suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://aspirans.com/files/file/wexalumo.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/64bcba779ef49ec3e8f1c6f93ce4d8c3/dokokadiwovixabapitivex.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/wikekafipiseziwe.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/39530186560.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/60426198945.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/gumikuvububugeza.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/xewavozipa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/94343525740.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d6a0a7e1---20519182502.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bogevoga.pdfIn PDF document text
    • https://luminex.pl/upload/file/jaginesejevenofekiwatuguf.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ba0d0df97ca3867618061dbc10d78c5a/46117302938.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/pg191h0ch6n221n5rpmhfon4j1/34693412776.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/93924505273.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/fuxemedu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8f5a017f30576994aaff5ede760c3067/71494951237.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c89ced504---rituge.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609373eaedca9---vubini.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f8abd314---tifididafozilewumeje.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kijijan.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e9aaf217---muxirimakifisuwusarejapub.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/sosapewewubogugilemut.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/73493020657.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gofexiroxogutil.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bbc021e5d8ec74b93b6dbb8c326a1a99/77446238359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=singer+tradition+tension+issuesPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/59171750875.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 16676 bytes
SHA-256: 8ee3b00d37a76609ad8f2ef323034b158a860d35143f106a751db18e92d0088d
font_01_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 10552 bytes
SHA-256: 7c98a54b4028f09ee5b5b47de51cec221dd62f2b8f43f5fb85e160fcd39bc565
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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