Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08e2da4016d3861…

MALICIOUS

PDF

86.6 KB Created: 2021-08-29 00:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9258362d7464c8d3643a095761ac0004 SHA-1: 2d1d8dbe536908f26c71b2c325e75515d0ec6078 SHA-256: c08e2da4016d3861d44bae85a7c45fc1fa184664c76b885b4eafec2f311f9ffd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites via a link farm. The embedded JavaScript may be used to further obfuscate the redirection or initiate a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=two+storey+high PDF link annotation
    • http://guowangcable.com/d/files/pidusikumogakopawur.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/482af1f81c96ff6e99fe00b03bf66279/madinolusezik.pdfIn PDF document text
    • http://mopron.ru/upload/files/54573795886.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/tinisavejasilarulutiw.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/50148094307.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/34315913428.pdfIn PDF document text
    • http://fitviewer.biz/files/file/xegevona.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5f8b7721bbb29ee45caebb50e64efa91/neretabug.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/bogafijoravosine.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210620152652_086ovj.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0b2b0d7d10f2260eda05b08de4a4d5b2/mapuv.pdfIn PDF document text
    • https://dhesient.com/media/44190762274.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/16745062129.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9a4b9e51---61781158623.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/32278891803.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cbb164afa---tawutemuk.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2d9b7738---devatifaresisumizi.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/tobob.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/duvezufuvutewe.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/71439183925.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/sixuzorotirafumi.pdfIn PDF document text
    • http://biomisszio.hu/tmp/79647977719.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 24316 bytes
SHA-256: d713194531d0f1b4661ec4e9b70cdfa22b28ae3cffcf13545b9c9dbddb43d7e2
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 10236 bytes
SHA-256: 764d184bc381e822d37c51294bfb37eeb0e50113be08e674bb541550e48d1c33
font_03_sfnt_off000143df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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