Malicious PDF — malware analysis report

Static analysis result for SHA-256 80832749563ef135…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 03:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c0aa8e31f50f1221d599d857ca4fbaf SHA-1: aa3e9785229d45c0b69fd36c6d34ef9de51af001 SHA-256: 80832749563ef135a881a095ba1425c2b3cae85118952162f2d9f510d94658c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing attachment (T1566.001) given the PDF format.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8632733c315ac510ce2fc93b17682f30/2771398168.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///giteviforaboxos.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160889dd8a85e3---53372945865.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/1937934076.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sja76bllivg065p97ovisol07v/vonunikili.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vabepajule.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/wefuguxepedekokepibetafa.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/wobegos.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///32375721207.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/rogedomuleronut.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1eed5a13---bonaxagewazikezabope.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/97556235390.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/keehs785h5hlgctqbkupfe4mjj/91586919338.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd243c6b8b---gizovafatapa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5ec76253---xiwexusepowidisuweladu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877cbf22375.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/gilaf.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/54210223793.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nazeputusedasudonode.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff02cd3773---jazigezikavakexuwo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/6abae6a768b1d44e8c541594059f0d74/77930186785.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/53123985909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=elasticity+bsc+physics+pdfPDF 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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 17556 bytes
SHA-256: c9cc85bfb0d5ffa5f8fcd91358487296c134b9abb962058f97ea318bc136a62f
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 10496 bytes
SHA-256: 19ef188fab5d85d3b7ce2c64ab391546020c4353d23585169b10b3d24dde4d08

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