Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c779510e460b0b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 00:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfc12452e5a8392e1a5302f2520db762 SHA-1: 0497d7b3455e5cbb884861fb1867ca11cc397625 SHA-256: d8c779510e460b0bcdf30fbdd06ae3cdad448f4e72817749048ac9452db41ca6
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to compromised websites, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=cast+phone+to+chrome PDF link annotation
    • http://paintmaster.hu/js/ckfinder/userfiles/files/buboxevukibuvifakuburosut.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/funoxiwenejam.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69819188062.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/83422758385.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/50728534056.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/44765097859.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/durixesajevidelasidoboruw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l9m8c7jp52q7m0i2vgvhphvgrt/93583320351.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f302326a8f---83319254657.pdfIn PDF document text
    • http://15881588.com/ckupload/files/nulowogifugidibojodevubo.pdfIn PDF document text
    • http://nenorm.com/files/files/9215974611.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/raniwi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/tonizebudoxojivabaduvajiw.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/47203096130.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/85469579631.pdfIn PDF document text
    • https://e-midas.ro/files/file/27197025874.pdfIn PDF document text
    • http://hodori247.com/uploads/files/xujifirusimojefidobedusi.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/dumabijubipezotavigu.pdfIn PDF document text
    • https://tekmaker.com/upload/files/guzeletoz.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/jeruxinuzawusubafega.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365413305d3---1957197759.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nejepezu.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/wuvefelefope.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/47363238930.pdfIn PDF document text
    • 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 10532 bytes
SHA-256: f0ea8e592e7ff1a9102e5c4c6b09e66024116e74e0de24d591044e2e62c1c35f
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 17856 bytes
SHA-256: 62b530d1cf4a17314d5d9b2a5fb27a7e7511414a86e0c947d42df8e7dcb5552e
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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