Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a481e3dbff50b72…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 16:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aefff655697d7e0a319dd07d4a1a5f8d SHA-1: 1c8ea5cc96e456e5300d220073ad8f90f367df86 SHA-256: 8a481e3dbff50b7266281f7d2d1f7c86f3af6249eb745a370858aa8b6b9c721a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r2suucsjf44bqo37bhspkg0r21/29009784445.pdf In PDF document text
    • http://studiocastigli.eu/userfiles/files/20905714480.pdfIn PDF document text
    • http://learningkey.org/userfiles/62579923139.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/nalegazoxejivilewukexo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fofudipu.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/92086282422.pdfIn PDF document text
    • http://polkovnik.su/upload/file/53660316083.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/jusinomuvun.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiwipedaxode.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ed3uhmpgsqkcj6da3v6nocco52/50330149478.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/52046003470.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/negibe.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161356dd034ba4---77131331604.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/nititojuxokis.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d9fbb1710---pewijegizexafazoril.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002a95888e---ligijuvusofajexujot.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fb1bb8f---28642422671.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/65673342751.pdfIn PDF document text
    • https://fratellifurloni.it/file/40341547094.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/tigalafabobexuxo.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/85635783477.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad181a36a---32475694222.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161319ebd75f12---82545183807.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/vopobotev.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/46939060258.pdfIn PDF document text
    • https://zzhqhi.com/d/files/safawapedut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=your+radio+app+nulledPDF 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_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 18144 bytes
SHA-256: c75dd3f56439dea67c5c025ce000226212c6843b3b7fdcc6477c4182980d0fcb
font_01_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 10200 bytes
SHA-256: 5d051f996831e9dda5f8a7d5029e724efcb8515c533367e4d81158d8e1371656
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1