Malicious PDF — malware analysis report

Static analysis result for SHA-256 e856634bf3f59fa6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 19:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70138116f312146b078fdfb99b6fc43c SHA-1: eae26a0d213fa2ebdf59fdf1fa8da7cef17f24c8 SHA-256: e856634bf3f59fa67780e06ddc312631fe6c1b26a37cc722579bf9ee85952376
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a large number of external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The primary intent appears to be directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=kiss+me+like+you+love+me+3+pdf PDF link annotation
    • https://travelworld.ro/userfiles/file/43828413373.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf2615efb---lumuzixoxopenogovi.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/resusazedefe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94a76178---71105921527.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4a8322c71b8dfe6a57c39a0f17708fed/dimizu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0f339aded---78184109442.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/17751164484.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614219bb48190---67646684478.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/91909027001.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/55221230907.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/35129776854.pdfIn PDF document text
    • http://www.heksan.com.pl/file/5673828193.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435f9c9e467---jonizinus.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/79154408676.pdfIn PDF document text
    • http://skisun.it/userfiles/files/65512832657.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/83131590045.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/sabibujevivodudo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o2vv84cuk7sm11ukstr9gk1q6v/32099211688.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/gadazevuwokewavosi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/dajusiwamolize.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/bekifenavepejitajepifeno.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fab86429862f0eac10d403219d4ec6d1/76035425280.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vuturalokedalixulus.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/nasufozaruw.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_off0000b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 10728 bytes
SHA-256: d66054bd8f93aaf41302c829d0cd4db392f83c3a94c560a5d2d3ca42a6a06e58
font_01_sfnt_off0000ca36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 15636 bytes
SHA-256: b005aae09a944d707e5e191ae28aff8f379fa3286e088519fd773edc2a1c348f

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