Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3d647aa3cb852e…

MALICIOUS

PDF

91.0 KB Created: 2021-09-02 02:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 358f56cd12711ad8d74a08b37ed49dcb SHA-1: b4979447b012b3633e409d01908b3df84d38a154 SHA-256: 4c3d647aa3cb852e6a63c40a34d3991cbd8b3fca1f80d4161b823282c2dace41
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure as a link farm on compromised upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://infrive.ru/uplcv?utm_term=trig+functions+table PDF link annotation
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5nnpdhatr2lc072ieg644k8g6d/61942595670.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/fowevinad.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/julomevakemukufadumesike.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/pikewupunojufulovotaf.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/fevololejan.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3qu2s3s1gtpcd5oa309di0r3gu/tiguxixanevujinosuto.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/iud40a9vb9j0r7e81331lkgf8f/19053627550.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/55831987591.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ladoxorekuxubimuzedu.pdfIn PDF document text
    • http://camwater.org/media/files/laxolegajarijipo.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/bosabebegemafenoledezif.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo4g08lkf11qf8hvqje581ige8/dozenonisezalewedinuv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ccb66bd5c---rogelenetaxaroxukeze.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/32902779159.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/05c4888d4bd0589b53b51517767864df/sebemegajepesiwunesivovod.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a1e17888---92243150867.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/vujuk.pdfIn PDF document text
    • https://mauspro.net/upload/files/17267189418.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080331799fba---fisofedibobumob.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vowolufeturididum.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/260655225149.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/98823744340.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/48109151127.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/983e6933c8cb6083a15b6f6877835e29/93849254759.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/pipimegumexifazufafipu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/358fccdacfda0c928910911ce1a1a6f3/63394924797.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/nizov.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_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10712 bytes
SHA-256: 2d9cd79537b2c7d79bfdb26fb94cc1b28202fdeba66e138e5eb8b38ed1fd85d6
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 20828 bytes
SHA-256: ac105637a7d8390eb95ad1246a575b05408bdfc6fa2850e9350d677508d92b4d
font_02_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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