Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd9d075c9dfb803…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 03:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0f8d3d982e2b016c68cfb2c04f2ef72 SHA-1: 3e43aab60c788a537c6c91f515c8065be68e0d70 SHA-256: 0fd9d075c9dfb803b9ead2555ca20a1f0748c1c889a9d3924b0f64e3ed856c9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found in the document body, which are designed to phish users or deliver further malware. The presence of multiple suspicious URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=st+peter%27s+medical+group+north PDF link annotation
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/zajesuji.pdfIn PDF document text
    • http://favourtec.com/attachment/file/32074366103.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210903_6E077AFE37272156.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96971130468.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe49bd195---murodik.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/68550547407.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/37012453230.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d09ecd6a---94044814478.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/28107173156.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/23678263943.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/90324436155.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/dimobekasodu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jlt4qvp4oc04sattp4v4sq8mri/43193908482.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/visoguxum.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/49168424955.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/fazavinevelategijolitid.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614272dc8604a---dixekaponomiguzav.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/xufasibodinopipelanuximi.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/30417877241.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2403a3108---4121272522.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/pawakukojetetigaduzidip.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/zanopuzabapawuliwinuj.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/vigilabures.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/46097073119.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_off0000bf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1D 16988 bytes
SHA-256: f62869db4624bfe70cf90423c4c6ff2ddb32919f4daa785b5897a8969d5fa2de
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 11172 bytes
SHA-256: d12c41e318536761fbcb6a5f2c7f67a7d74e8440713e91742eaf0ac7c33dea73
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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