Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a586133506516c6…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 04:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19b5f00e765143f3aca65864c231fe3e SHA-1: 4f5b196b3bc2a461a95ee4b2ab84cb126e56f279 SHA-256: 2a586133506516c6051b16de84c8a4ed92a48facbb5eb08e52f916df1b186ee4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://ok-poland.com/userfiles/file/89134879569.pdf In PDF document text
    • http://veterina-hrib.cz/user-uploads/files/79297972954.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/a6gtk2jakgv1v1s76fcin71pt7/nazunumu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/penalajij.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec2ccae8c---nogimojejudowixiwem.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607db057f1692---fumab.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/46485f7a685adf34ad9f8b2aa8331bf8/vifasodewawemezaf.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xitesunam.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c44030563a---83730293905.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/44757490149.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d88755893---94865134767.pdfIn PDF document text
    • https://maturana.cl/upload/file/44762233282.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/bemivuzomugogugesaro.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pezefuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=father+and+daughter+wedding+dance+songsPDF 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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16608 bytes
SHA-256: 5e4e1f72b20a418fbd6dbe761a1bd12d9094ad6c5dee3a0282c7167a6c2204a8
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 10764 bytes
SHA-256: 9839b1ed915e0dd87ae6c9f0711d6be90e0cbe0b073e6dff922e9e1977531ba0
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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