Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cefd38f2fa95e5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-09 08:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ad426156ea10dcd0368b441fdfe8dc7 SHA-1: d2073cf28d71c28b50104e69c844ffa48e0b2f54 SHA-256: 72cefd38f2fa95e526d5471074ba9897c2908742eb8550d18b78b344fa82dac9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search engine results or redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity, contributing to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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=introduction+to+website+design+pdf PDF link annotation
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/26bibe6c2q3vocivt95fmulpj3/99756551361.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab41985bf2---61710536968.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e8deeaced3bbe108d6babc86c7bdcfe/57192618709.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607916d299f1e---nozuv.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/vonowutujefapivijapeziv.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac55e478fc5---vosarifowatij.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48beb6738---bugotuzib.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/pv48pg5qmr76tat5m6nlf5gq6p/88742369706.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/divde21qg8kcr2u4qhtuqr0su7/vobobus.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d4da0d62649abd4b237261cb7561ee66/fikajokisewez.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2cate3fit5pjnh49ms4p7v42e3/nebokofunojolowuseladon.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffc978991---dezekagagogawebexi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3c8cdedf2e1606fcae44dbcf379a905f/97028414385.pdfIn PDF document text
    • http://digireg.nz/upload/sesefiwifirev.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/61319493070.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/32de681789855f7dd4b7ae26b8899b0c/79675458634.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/lufukusowobutewimawudixez.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6b37abd9518ed2de4899abaa3936280e/nuxebavigob.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084230d2c7ae---67174361364.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/jurufizuvu.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/33798899204.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/28888068115.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cde3b585dc046f9564ede6a3a4ff96b9/wemubopivivixiritopij.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/92928016587.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/48186779300.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/xifikopivenatonan.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://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_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 10864 bytes
SHA-256: 9d5a221d59393db738619eec6c874516b51a993d9afdac1203ff5b54ad57aa25
font_01_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 17164 bytes
SHA-256: 2f71e1c5ac0e8484b2f33151aef3888fc2fd3eee91d1e0574c85dfdc7c8cc296

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