Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aad0b033dabcbcf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 23:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa6aeb3cb62157da619681c4b9dbd56e SHA-1: 8c595601647c9bacbaabcf5c4d8bbfca744e22cd SHA-256: 9aad0b033dabcbcf3b44699699bec95fabdd30c16074570266dc2b428ef205bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. These links likely serve as a link farm to redirect users to malicious content or download further stages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=photo+editor+app+for+computer+download PDF link annotation
    • http://nfrostov.ru/upload/files/11492129529.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ca7dcaa15f56cc0bc27ab0c8cd437619/97655517805.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614712a875168---70136723457.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/2785130325.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pikibitafovinafujiwibefi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614970c71fbc4---sopatesile.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/75959146139.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/ropitadeb.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/60620094187.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/6002896301.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/sunumab.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161325f826c85e---buraxobaduzefifat.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/wovonirop.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/76453511023.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/sogowamukuwozuvudefa.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/10064303397.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/66945736583.pdfIn PDF document text
    • http://lovesenergy.nl/file/72081481906.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/81423561685.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/mijidiribidomulani.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6aff514667517aa5fff2b812e214577b/nopofapinawubam.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wikevasag.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/zozoratoverametexogibofe.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/gobiranotinebolim.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/bilutedovo.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_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16820 bytes
SHA-256: 460e7fcfeb82476b2f21e30e20502ee5fb815f38a8ed697c6783fc96906f899f
font_01_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 10904 bytes
SHA-256: 74563db3ae10befedfe8707bf35df118af4d08ca0fd63a4f24095f021395abda
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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