Malicious PDF — malware analysis report

Static analysis result for SHA-256 3265f24764c71c3e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 14:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10a26653273c5e18645db91397b68f2d SHA-1: 71f4b0ccea6df048bdb6b548dcb695b3b192bcf9 SHA-256: 3265f24764c71c3efdf1a39658aa449c9b015978eeea9ff4542cb4954d5dba78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, a technique often used to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the final destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7e7f1a45---seniworewuzekotu.pdf In PDF document text
    • http://stefanourso.com/public/userfiles/file/mogij.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16309973614001.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168bb5287a---pirodexejutesen.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904093040675.pdfIn PDF document text
    • http://happy-land.hu/editor_up/79885352914.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/73527867378.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/84551526879.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/81452322493.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe7f80e1e---gunefifalu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350bad0746d---fegaseropebifuluxukaw.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/1575831238.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/fijuvuvonu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/52842c32aedce935095bf7f8ebbbe09f/xamuwepuzuga.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/48632506417.pdfIn PDF document text
    • https://majubesar.info/contents/files/37812493706.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210904095138.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109070824031516.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910132833423420.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/nitizi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///lixirekukesapimesaropi.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pabunoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=real+followers+apk+modPDF 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_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10588 bytes
SHA-256: 96f1b6075eaf9facd68fb31dac89659f39639174683a28c51ae900d311497856
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 17508 bytes
SHA-256: 78fd89e865ca11cbf2daf9c29198e2ac08e88d6c5b8d16d9fa1431dd2e18e5a0

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