Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1a19d52419c86a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 14:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c48e96e7621b888877ef3272d4467d4 SHA-1: d98b26ef7b852a1325215c1f838911e4e8daaf06 SHA-256: 8a1a19d52419c86ae3276956147804dc6c8241ac2adf330d3aa8b629bdedecae
244 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of a password-protected archive lure suggests an attempt to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=unir+dos+documentos+pdf+en+linea PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6502a269---binipoze.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/vazabebaxu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d20a2f2bfa80a0fca403515a9802ab28/ladazunegodabaledapa.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/vipamuxonigug.pdfIn PDF document text
    • https://ratosatu.com/contents/files/guguvokusinafolijokigepew.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/34509003728.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/23141724110.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/91487197614.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608955d7b78cf---mavevusizederawevowelu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215101228368467.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/153de3bf5b6763fe174a064586d1c8ae/dajizogafaje.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd0da8b73a---melimewimujokifud.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/wakivupizot.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/84014344704.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc3925e722---58589773494.pdfIn PDF document text
    • http://djpress.pl/Image/files/natixiwi.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/rexelemejokasepetoropuzid.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c477ca41822---13066422377.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef0d5eb14---dodiwejemekevigezerikaxi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb81c33770---wajurovanesebarumigulu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210813062629.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/30980067613.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/nuwaredajogu.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/fifegugizufasagi.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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 18736 bytes
SHA-256: 04da86725fe268aaa7209f73f55a55eb9bf4baab551226f397e988628a6d564a
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10888 bytes
SHA-256: ee57c025280eb8d78f095ce6e6c188b80422c44b394499138250f2fcabbe1ec3

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