Malicious PDF — malware analysis report

Static analysis result for SHA-256 74814aaadc1925d0…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 02:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8e770d1e51d3f82d5d2ebd8038a2b07 SHA-1: a737a3f2332df68f7982ac916f558f9f90b244cc SHA-256: 74814aaadc1925d0064a600d132817b8c0ddeccedf1c87de3014cd9f804b9301
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings suggests an attempt to obscure the true destination or leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/ponapipaguwemolek.pdf In PDF document text
    • http://arsvet.ru/img/upload/xuvug.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/59353892770.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e695c145---33498298273.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/12345460271.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/12493261464.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/22359560809.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/42082914969.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614529860292c---matamaxakolepupam.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141233e80fea---vizufepef.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9f5e87f4---82891617989.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16149b273858ca---12348805881.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/kofeb.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/48523583864.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/11718757794.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/rafitomeje.pdfIn PDF document text
    • https://wsbtitan.com/images/file/23463530346.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/12955634397.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/47990052426.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/gobupegijiwezedew.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12787443312.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/nepedumiwavenusap.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/pizatofeverigep.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fidafigagefogijodipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mobile+tracker+free+login+app+downloadPDF link annotation
    • 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 16224 bytes
SHA-256: c37db15dfcc00e629bfb632eb2398f9365d3213688a568557e5ebdf67664b14f
font_02_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10936 bytes
SHA-256: c05bbe2fa368732db3d45199352bb8f74cd7c101cd91f12579a34d696d4afae2