Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bcea6f2141260e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 11:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c20a0063a12d73be3a13a4edee8cebd SHA-1: 194701f34a5477aa0b9018ab90a5e4557a916895 SHA-256: b9bcea6f2141260ef5efe3486e2b350744b84238d4a21b225a0fbd4a5c92f602
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are hosted on compromised WordPress sites or other disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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.
  • 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://irlanc.ru/uplcv?utm_term=super+mario+flash+3+game PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde9cdcc9---bofedivututepobinisewanon.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1fqijr66r1eb40s8p0baoni333/47918165254.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/tagemurafofelomi.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/dizuxugovoribekofewi.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/67087414578.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/34616855508.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pelowewilikos.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/namujujedalew.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jevaserifobopipiwowimaxas.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b70dd91ca---fodazupotaligapetu.pdfIn PDF document text
    • http://wwsm-us.com/files/file/zezobulixo.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/jugomizabogurura.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210913172649.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vudowavetezube.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed996fa7b---fotisi.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/16166873847.pdfIn PDF document text
    • https://majubesar.com/contents/files/wudowuz.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/m1uddllglng458h7bo6lc2fij1/toguluren.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/potetitusupaseguv.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/sevalek.pdfIn PDF document text
    • https://vitanov.rs/files/golijalararag.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/22ca5489a6d8f39f21fe65fd3b01d9ba/71598403677.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/norijilusafibetaduzu.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/21584835308.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10948 bytes
SHA-256: 8cbb9297ad23815f4826a5118ff6d2bbfcf4215ad1e79d6060e424086d14d611
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 18720 bytes
SHA-256: 63a76d7bc7c341bd43a4c789e2044f5a8fd020fca6f9cb5d9736f63544da8cff

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