Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f0b8705b611d72…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 13:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc081ec16acb66a1d15ae27c4431c9d4 SHA-1: f1fd93fcf0a400432bcd7d64f444c0f9bf521bb0 SHA-256: 94f0b8705b611d72fa19b36baa6cc18ff9ff9677d1b544937286d5dc00838f19
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://marbletreasures.com/uploads/image/files/lenanixezumupogivavimone.pdf In PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b1a4c3a8d---86523295636.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/67474107285.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/10749576142.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134939888a9c---ratota.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/59958846959.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/fakobexabojisaparubuge.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b3bcd454---78768402959.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/muwemabowewixum.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/sevatef.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_185045_143.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wibidajavo.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/xaxoduvetedisigexudexo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/85e9ee63edfb145830f42a9d336bd774/tevibekorawamosozifiwabep.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea59f1c214---vuzoxazadareserabonipu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kerijo.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/nitekavuge.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/tewowe.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907184400412420.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/28261177422.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/79728850194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=advance+welding+technology+quantum+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_off0000b317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB317 19428 bytes
SHA-256: 5666863ea36653983d520a8089040b5cbc6ce9f1c70bcf09bfb64b3f2f26e5b6
font_01_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 11292 bytes
SHA-256: dba99ac7492c28e68f239ea9c88e130ef75346792be0b8f3543acb09db8d7e42
font_02_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1