Malicious PDF — malware analysis report

Static analysis result for SHA-256 2242a16e65413883…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 06:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58d36c297cb3ab3c3a4d569b1909181d SHA-1: 1957528d5142afbe348a2c9c7ad9fb9009cf7274 SHA-256: 2242a16e654138839ff0ae174f6220828b272e9108916f99cbb1b9df41b54898
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or spread malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c21b3ada8---sederokifufa.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gobiwimapirisami.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/xakusomojukofeme.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/xezexopojuminavuni.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/5634500115.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/tiqj7euftlhdtcq0va87ov3ged/36500399708.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/11406173630.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/18372bfa4c706e3adce7f43ad2bda91a/gotubolu.pdfIn PDF document text
    • https://penal-garazh.ru/files/sesawofavepodozawumoruta.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/dujoseribejelafexodevewu.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/30515882996.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b78346e23b681a6b09cbc186b1401d87/naxagibavanenakubamevobi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210704180455.pdfIn PDF document text
    • http://deltools.com/userfiles/file/81841332732.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/diromixaxepinosepopikev.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/zuwopewudata.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac7a2619---67626268074.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee284cbad58---92483933665.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a704e9f9---9934811554.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/julekuxipemewategite.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/wowab.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3161f7017990a03e2f393050ef67d2d0/69981400662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=solutions+of+poverty+pdfPDF 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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 17088 bytes
SHA-256: 728970ede84a45c940c8f091fa612e410fb3629e2e393f72d5bea9d9f509a629
font_01_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 10684 bytes
SHA-256: b8aaebf66b93501a0e13d4bb0218026b696362f1a5301e1975ac1b7c5f457802

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