Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e1a1c1e7c98d27…

MALICIOUS

PDF

88.6 KB Created: 2021-07-16 13:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d8991a21e26c3168716e912ad690d63 SHA-1: c5b9184ab708abbc713ea02cc65218c5d4c6d4ca SHA-256: 12e1a1c1e7c98d27ba19fcf405352061e3929bee2044040db27e248005c46d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV detection and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to manipulate search engine results or distribute content through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://abeess.com/userfiles/file/femabefomalamab.pdf In PDF document text
    • http://uniquecharacters.com/upload/files/lilunopuxapego.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/futox.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/18kskrhfio2q7hjf4s3a2mgtq3/14439178341.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/kufefux.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sof0k1dh17hl2apetlngkl5dnf/sejabemimedemobe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vq8r231tt4j4k57819rloncmq6/57373513197.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/gudoxadekafogadadoti.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/zafapudi.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/besokasijadoj.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210606145018_1984386730.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/nadugedesabugimogaduvebu.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/76632909486.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/70090690016.pdfIn PDF document text
    • http://medi-sen.com/files/files/89447272654.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3e1c49b47f72ab7d7e943474ef408206/meranegewelalobajana.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/lufusofedojaputikuvoguf.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/51870369827.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/puzevizedatubul.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160852ffa1de9e---vugateme.pdfIn PDF document text
    • http://sooclose.eu/upload/File/13110919501.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec1f1403446dfe57f38e79796c4bccc2/10781529934.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160785b119aa70---wexavidabo.pdfIn PDF document text
    • https://nevisnews.com/userfiles/43826208805.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rlck4mmc98am8u838maa4a2b70/58035235920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=scale+for+fishPDF 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_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 17692 bytes
SHA-256: 88f5923e3bc2626b9191f1f86455e2c913f4abe10b48866fc0aaaf909baf3f33
font_01_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 10304 bytes
SHA-256: 013dc78c61e0f5f4de77f116eedffd8529fc9b41b7ab64f5147764e61eeaa9a7