Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1b8fc7f262d97e…

MALICIOUS

PDF

90.8 KB Created: 2021-08-02 23:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c929bba592b1cbf8bf869977b8fcf329 SHA-1: bf0c573e5dbc1ad56af8db400670d4adbab7474c SHA-256: 4b1b8fc7f262d97e4a75cec11693b6f477380f6206bd65460db68b9024eea6a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary goal appears to be directing users to external sites, potentially for phishing or SEO spam, rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sangtaoad.com/uploads/userfiles/file/51594075317.pdf In PDF document text
    • http://consade.com/userfiles/file/kujakaduduzaniwikisavuv.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b091107c04b---9217928404.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b2a579c7---69134266320.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fln12kifs5bqvlg4flm3tlso26/gegisavuzezosidapeku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/s0r50pmlpamrjo8fbkknoett6t/70124163941.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/77411316695.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/lebodepogugoku.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cc659a9d6---43060553351.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nowokawosazesuzupome.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/tatemunetiwafizefuzijezar.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/19089559604.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4cc7b1a2c606313931e9609651d866f9/xizumukefululizowegizija.pdfIn PDF document text
    • https://biocoils.com/img/file/67337700788.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/2866264773.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097bd9687d5e---gasilota.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aff3329dc---xibudonogukejugekinipag.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/rekipoburikoxokusukim.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/jadipaz.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/34810252568.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/sarerinexobabuzeregiwogov.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9g0j2toasrs9moal8erovjp4b3/dopidiso.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e829bf73a9d---27187632573.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/wanutebejuzifalekev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wedding+anniversary+wishes+video+song+in+tamilPDF link annotation
    • 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_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 10952 bytes
SHA-256: 21c186a57b78ab7d948648a32f2074ed4a51c3c4f8cb5e578052f6979b2039e2
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 17408 bytes
SHA-256: 5f773708e1d84eb0967f76d58a1f5d7b76990d539b0b39923e068dab9bf5ce94
font_03_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16688 bytes
SHA-256: 65fb8aa58330ecf910c97585009596428ec8e60aaa47b80d44366b795b56e303

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