Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfe8c64e85f303f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 05:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7db6e9a0d8523a01c6c0525e9f1ab4ec SHA-1: 2322335fcb45521aecc39b56a2670b447d0aeeea SHA-256: 9bfe8c64e85f303fec34a403c11090b354ac0b22a7ac44901671fc235270bfbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this assessment, as they likely serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://olterus.net/contents/files/mosiforizi.pdf In PDF document text
    • http://faw-asia.com/image/upload/files/72370644215.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d12bbf3---46568848119.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722bca197e9---boxer.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/duvuzegixujejesawozudasob.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vroepr7bquqfregh8i1rpvh9dt/jafasa.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/mupoxasinewifinogejux.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/13617653336.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/96678845357.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1664bba9---nakamazawekujazawometile.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612467a9f3722---bijaf.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/40f278838d9c94a9af427b8c9fc3fa71/69068717947.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210823_134EFBD8E9ED8418.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/sovumebolul.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/rogujavezululoxijoduf.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c105d4d38beef04d14b656979d17eec/32061642367.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852c2e8eb75---vuguwozalunufuge.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/62437602679.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/79109284065.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/vanapijafidura.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/34326445501.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/904f0c2a6d183bbba2962bed18a53a0a/87004212761.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a162d0098b0---firewodunovex.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/55810049510.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe7a704c3---4838483889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=anime+where+main+character+is+op+but+hides+itPDF 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 11040 bytes
SHA-256: 0d421892059b0babdbaad05c1d5211447f0d6c43d4fed7f54e01564b0a326370
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 18224 bytes
SHA-256: 0a6545cb62a62f638ce151b69c23114c27b7919f259fb64d6c9c812ab57f116e

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