Malicious PDF — malware analysis report

Static analysis result for SHA-256 a035c020984d01f2…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 15:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a38f2268ca6b5cf322c046386b115bd4 SHA-1: ddebf7d43d8e2762bc9f0c54e6d38cf8db5e815d SHA-256: a035c020984d01f276767e920ada74f71c62aa2fe095531ae800d9ba2c8e2da6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jjw-led.com/userfiles/file/76588988902.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0932952950b83843cd346d41cca3415/wikivodusidirerewaz.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/sivavigixo.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/boruxelizunobilegojan.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607467877a0f2---bexexaluzanotebuj.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fce9583c977052a612be46c028985b5/62745282815.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/fafogilop.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/galafijodojukemabititexeb.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jugebutasufepiz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fe9d863e7---rilifuzakeboti.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jametazopapugokisuwomur.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/59160930532.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3076e3feb1dade1fd428bb4b0dd6428a/45986970517.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/fefutaxijujixuwa.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/97762755388.pdfIn PDF document text
    • https://hse.tw/upload/file/wewumoxajulexezokawuxuzar.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/gajekoraveki.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/kemafibusatisosopu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/90909264738.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/agtvkf835arkoecbn9a1i55r86/kivaluxekalisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=database+concepts+8th+edition+answersPDF 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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 18108 bytes
SHA-256: c951e2a0ef20d314d08e92a980c4e93725923a9ee6348ebaf74dda6815374ebc
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 11000 bytes
SHA-256: 183aa1f0713044ecead68487d47e7b71ca3a6d4696fea41b4e710ae8fb886131