Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1252298cc27d225…

MALICIOUS

PDF

84.4 KB Created: 2021-07-26 09:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fcab2e0a305d78a8837244ea86a6e57 SHA-1: e76868aabc7049ed263e2b961c5dd4b9fbf7fd95 SHA-256: e1252298cc27d225d791129d22edc0238b056f82c0fe8b5957d2591ea1c30d58
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 WordPress installations and disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms it as a phishing/trojan PDF. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5ead51da4993ac773b27f261bfa1e1e5/6614109592.pdf In PDF document text
    • https://landi-bg.com/images/file/2996124768.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/tezukiritunikiligofamo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6d82d399673feb490a9d19703fd9f71e/podinaseri.pdfIn PDF document text
    • http://billsky.ee/files/file/45708024158.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a45eb2232ce2be832121e0ca1efe0f8f/makuleje.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/42168813077.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/c6t5bpippo253c4t35dkrsg398/pivilajoga.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kolamafofesalaronore.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fbe0d2e12---pijepuwo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e57c3fe2d5f434fc23c08f86bec716f6/mateguregoxevewop.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/94351846337.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nm1433g1sa2gd38j36fia28sgl/66879454213.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/34693bdbcf0c5a0d7585fd2a50a7572d/42865472735.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5eilrfu7rs0ti25k9r2e0u2i55/68415192140.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/661545f17b76c1e21a37b2ffb69e7e7e/jutedanigokobivakug.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aa6ae4552---susapiw.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/35742590255.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095f21c09e67---69549301249.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/77206116335.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/05b092d7fc81ac898445181f7096eb37/kiguji.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f502c3699d2---13168103081.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0drd2olquh46u6vbuj1m7jgjfk/fujuro.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/41b4a2f17da27ceb150adba0ca65888f/32118185142.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/57384208697.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fcl4vim9r0cdef0g0gmnicqeg4/delebafinemenijatuvim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=100+hard+word+search+puzzles+printable+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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 11180 bytes
SHA-256: bbda6c68cb61454cc848daebe86b2faf4351a702f81d4e688cf439d30fd3c80f
font_02_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 16292 bytes
SHA-256: 5af7aff241df3c9ba1d9ffab27c52714376f55ef9e545374921ea0b720f19815