Malicious PDF — malware analysis report

Static analysis result for SHA-256 1618aca5b2ef2a73…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 08:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2eabc8ed0848b6448c70bd03068b1354 SHA-1: 027c482b2b7f9fec0be70aa08e266f242c39113f SHA-256: 1618aca5b2ef2a735b4840f50dc5bada0a167e6d187e08df1db361b9cff3339a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=common+3+syllable+words PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/67458343cacf8b60754d3f8f5e1a98c6/63191642195.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/50961436680.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e6e1a589---65060087408.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/rikazurefobiwazuminikofu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/buxasibasisabita.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/zijisoxi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/19545676489.pdfIn PDF document text
    • http://klhl.com/userfiles/file/6148293379.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/5537518802.pdfIn PDF document text
    • http://indemo.pl/Image/files/kopopabeletopisalimawofa.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/werewedojozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54f502f90---57500937613.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b109a945ec1---47907746049.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/32204188787.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c1462b63683343a3498605a8463891e8/36802277327.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/13607883758.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/mivawemigidul.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/22558405200.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/lusijazolozidafikurofiza.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xapigubuwagalawivur.pdfIn PDF document text
    • http://winso.tw/userfiles/file/gonimezujidedi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83b111ee3---biwowoziwuwijopura.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/xepases.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/lawifodojetagamutaduji.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_off0000bae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 10764 bytes
SHA-256: bb8b042c48f26f779ae633134604a196986ec5208689c9673110fb58a85d2646
font_01_sfnt_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16100 bytes
SHA-256: f8ced0bb64bf8add27109e781fa2adef3213144c44284cbf442e18d3e10bacfc

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