Malicious PDF — malware analysis report

Static analysis result for SHA-256 868d06c1e5f9fceb…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 22:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2ae36ae328a110b97cf884030cc88d0 SHA-1: 435c7df596c60d6b1ebe48ab93def9c2f4e515c2 SHA-256: 868d06c1e5f9fceb8e30c74c638deb90e21e110a42facb92e0566560b0ab06e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and functions as a link farm pointing to potentially compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are numerous and varied, suggesting an attempt to distribute phishing content or further malware. The presence of multiple external URIs and a link farm structure strongly indicates a malicious intent to direct users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=hanya+yanagihara+a+little+life+pdf PDF link annotation
    • https://datxeninhbinh.com/data/dulieu/files/lufobujegaxudole.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/virazixanofete.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d43085db8---91885052026.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/vavajefigiji.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3235a9a9a59d0262ebd68a50c6785b5f/zolatu.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/89970626515.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/dosifezox.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/rezogenudorim.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/takumasifejejete.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wagozirejulij.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/gibemaxur.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137c35971fa7---13988060518.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/61983704946.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/kidopi.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/78383073215.pdfIn PDF document text
    • http://iucecb.com/files/file/rakosusizul.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/34816565196.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/pibejigus.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/madenojadipovowisodawe.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/gizejeleva.pdfIn PDF document text
    • https://preciseenergygroup.com/media/90057552397.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94912274084.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e756b2cc8---74167000111.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210904_152053.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/97051382751.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_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10596 bytes
SHA-256: c3a4b0a7265531c88a7327b61d66d0a5160e7cc2cf5a9cb1ec504373f648a9f9
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 17344 bytes
SHA-256: d4bdf0b2e5f955f8d4c72b779cc9869ccfbebf03632eeafe4a58ee9eedadb0b4
font_02_sfnt_off0001368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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