Malicious PDF — malware analysis report

Static analysis result for SHA-256 3960f757cec2742a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 02:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e336c3416985a3989dc1fb97d3bebe9d SHA-1: ffeea57a803afff7a60a54c04d7c53792463be7a SHA-256: 3960f757cec2742abfce4f04a09e49390b18bb1324e17c6fbaaafcbce64cf7f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://fapannimario.it/userfiles/files/81102148614.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139653311695---ratefiwukuwudim.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/83645729150.pdfIn PDF document text
    • https://masihpt1.com/contents/files/24359457375.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/38727928710.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4d5c2c4e---57347603498.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-14-05-57-07-ULhS2CZl.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/11178201075.pdfIn PDF document text
    • http://mobiliteit.nu/files/14293522234.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/1512891832.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/10154991742.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fg21fu9r3ac1ltc5i7t9ea3217/97131779704.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/86797671135.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/19104026746.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/68256616077.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zelopivudelafibevuzirari.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/28308897440.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/19268211773.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fuguboregelabuku.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/54014189344.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb16429cb0---52528997288.pdfIn PDF document text
    • http://gensugroup.com/upload/files/17112951278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apk+downloader+for+windows+xpPDF 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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 10652 bytes
SHA-256: 814a7f044a9fce6cb7f3da8abccf01dfc3092cbb059002f7b41310087bfe1236
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 17704 bytes
SHA-256: 077067a07f07804ef2439f6a4811f79496ff7d09324117b76d338c4eeecd5b0f
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1