Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c849481d942417…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 20:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7cc4b30b715134888b840e42de176101 SHA-1: 0669f9f2607c3e200cb2ff84d603dd864d29c9e9 SHA-256: 18c849481d942417d0272e5918e9df671b4fc1cda2f3d67774b0bd5a713da15f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs pointing to various websites, many of which are hosted on compromised CMS upload storage or disposable hosting. The presence of these links suggests the document is likely used for phishing or to redirect users to sites that host malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=zoology+projects+for+class+12+pdf PDF link annotation
    • http://insureacompany.com/userfiles/file/13666996888.pdfIn PDF document text
    • http://halmar.info/userfiles/file/dotejudejo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/73400260730.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/3d9727b4c36897a462f3f630c1c01ac0/7296367025.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/mimevitapugow.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/16614409951.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/jajajisamapiviwokidabur.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dv8t0nm15vevq1qji9ibf420l5/pofomuzotisujawudit.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/xiwutaparen.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/41244010424.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/ledalizifimikuvivejamalo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/welesugaverujirazelizud.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eb1ea502d---kitetenunotofotejam.pdfIn PDF document text
    • https://sainaudit.mn/File/7584284948.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/d97775364139d4e339950cb75790e5bd/ranesulukepuwapa.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/63359676491.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/15359398597.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b5608ff6---napenubabegematazuroge.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/xibidopa.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/xasun.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a62a7ca3f2a923c70c6007d908bb414b/90859739397.pdfIn PDF document text
    • http://camonetinternational.com/files/file/karefatatifagekuwumudaka.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_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 18044 bytes
SHA-256: d407ca3d98ac608cf7466785208cb9033266ba1be9c9c63e6fd1c2e873b9bb04
font_02_sfnt_off000118c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10976 bytes
SHA-256: 56e94bd9d1efc9111a3a45c8120c68868e2fabc64fdc8f0135a210030475a4b9

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