Malicious PDF — malware analysis report

Static analysis result for SHA-256 706fff000bc2a71f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 23:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d30d5b57f7a3ddd3bf096b7c9ec3153f SHA-1: cdd3413338fec8a0442b6886d85a70e64f373129 SHA-256: 706fff000bc2a71fc9d3b62b339141d6b2108fb75ce08c7109516ff1178289d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://aucontecnologia.com/userfiles/files/7634314423.pdf In PDF document text
    • http://officinedesign.it/userfiles/files/70292213129.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/lajajojifufuj.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/sagukizusimuzefew.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/zadazofibidimaxetirubuk.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/66610108035.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cd424bb2---lulepemudowasuketop.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc864c6428---bubajijol.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99fd4dfe003918aad9ee46bda765a8e2/vuwinitanozodozu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/safezed.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/tiliziwinogetasogifu.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/jazewis.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/jomogisewujinekonujid.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/69433454729.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f296cd7a---71783975404.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/49730026177.pdfIn PDF document text
    • https://mkontroll.hu/File/84516726471.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3147620711.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/xeradaj.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/fibamiladuvugifafaj.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wijizerib.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08a036626---wudagirapoki.pdfIn PDF document text
    • http://texmet.pl/userimages/file/navid.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/41276007388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+play+gta+4+on+androidPDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 10536 bytes
SHA-256: 2d4d6eae3d8dd9d845bae6103e0acb96adb27272d5eed2cbb17fc1a86b50e88e
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16404 bytes
SHA-256: 119b07adc0b0bf83e2f76b31bae23ab3e26b39fce945ef1e6582e1e6e8f104ca

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