Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6643cd73dbc183…

MALICIOUS

PDF

74.6 KB Created: 2021-08-10 17:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3ab7fa1bd350d37cd95c6a1a32c4701 SHA-1: f92fc2666616a86b366893ed69d79b9de269ee20 SHA-256: 1a6643cd73dbc1838626699f63e9d357e6498977ecbe9ec4324dc4dccf0be9da
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, specifically targeting their file upload functionality. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of link farms on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092389a2a92f---87813440215.pdf In PDF document text
    • http://stellarp.com/userfiles/files/32277219960.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/gofigejozabagalejo.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/53400721718.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/30225241581.pdfIn PDF document text
    • http://gtshotel.it/images/file/84777092678.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/52965483718.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/e1v7qsbcjqneh9vl7s3uig1qoe/9542699376.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n3b16jv1lnfp0mo0qr52nd8apn/fazodorodapitil.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/616af93e65ede03013325ded106e79d8/4031740211.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/78091274647.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/xulerorubebesoketeworamez.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1216688aecd1c0f37ea7ef43f20d368a/jelukepefarutavem.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6cva4fv3k9sang8sct30c4ntn0/25816653421.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/76457667518.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553c780485---83935407755.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/daxowatapubato.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdea52783a---mijajuwabi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/fewivomewititemolo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/82915477bbba4967a1ecf9c9a43a74fd/kojisuwubibituwokipoxar.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/bemeforuzuwulezugemer.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/detupal.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d28772160---rezazulel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cambridge+vocabulary+for+ielts+advanced+band+6.5%2B+without+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_off0000c05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05B 15216 bytes
SHA-256: bddb23f8aa2f76ad29d47f089e6279935b760ac0a70e62e3622d76d2fdb95094
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 11828 bytes
SHA-256: bb6f8bf6b01ee844bc32537af4b7d597479ceccd4fab83bf871e86dacef609a5