Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eadac1126bc74ee…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 08:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27bb30a4298e22d5974c765b8949a325 SHA-1: 52c859fa150273f2ca4c8c6700f399e9eb83110f SHA-256: 3eadac1126bc74ee55ceec74fb67e27de7e3082d00702d3d9e3c911c7bd51f46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=korean+grammar+in+use+pdf PDF link annotation
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210628082859.pdfIn PDF document text
    • http://fittbikese.hu/files/file/8600753636.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108030616358263.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/bc6235c5f5f95816bdecb57ba076c89b/tosilexe.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gonuzezogaj.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/cc03f8cb455eb6631371d4114d499366/mavezuf.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o5e2vg5udchdc1l82j5rupl951/wazilewadozimoruko.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/sifomus.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/55317636769.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e6a28342---72063062026.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/806168939.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/vasejeremubenu.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/908944c69c424c5caede47dbf5ee18d7/zunidizemimakap.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cb3f352bef13003d9c781ab485348e09/rojexafeb.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/32b1841764c03e4a0cbb27a57da3867f/63032325511.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210826_E4EAE3C2759F7424.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/34102910076.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/fdb090bbd08e603d3d85c90e8ce0158a/68511749931.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6f16bffd3---70597593650.pdfIn PDF document text
    • https://jurad.eu/files/file/nafovilemumolavewu.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/resivururolesakasitamep.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/xijosonuxinesuwif.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/24909230503.pdfIn PDF document text
    • 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_off0000c0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D4 10788 bytes
SHA-256: 63fd132297de081a6dd1b4ab2a2f7ca04e4324a7ff761780091b71e89d172d64
font_01_sfnt_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 24316 bytes
SHA-256: 3bff0e75d2b68a7d2b70e5950620f1fb802bc8205721bf9ff55b6c2271e7f670
font_02_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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