Malicious PDF — malware analysis report

Static analysis result for SHA-256 a018b6d87c298ccb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 22:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 214cbf34beccb1d533f061b36f2f3897 SHA-1: 87977672becec50f0d92f47894f44c405613a9b5 SHA-256: a018b6d87c298ccb4a223f722015b73765e73263824f4960b52a6f3a4501b493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=math+pizzazz+algebra+pdf PDF link annotation
    • http://puzynowska-kancelaria.com/userfiles/file/zazibojavitasugis.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/75182744376.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wolabuxerajofujod.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/32010994469.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5c17bd88---dinadixixiguxoruvugiga.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/88387662768.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c887c21ce04---lafet.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9611c8440d---60646148422.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0fncaa2oeiik4862g3ts6fpr3m/53718030890.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a059ed2620e3b75cbdd2f476ad51aab5/gogujepoziduxob.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/951ae8b2fbc9d12afe64889760146598/79879897516.pdfIn PDF document text
    • http://vinmexindia.com/uploads/86613503218.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021720643562590.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/42027076461.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/33543314186.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xelogujut.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ef27057972dc910bd6a68487a5a156db/bimapixibatonituguzuvovu.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/82563092536.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441dfb5dc6---bubabifiku.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5u3qolvf5j1lapvjs7u9q61aa2/guxijejesakazener.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d5808e8c2d82bea1ff6270c1a33f3216/murifu.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/52803724635.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/dinitupapadidexij.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-14/20210814183414763264.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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 17652 bytes
SHA-256: fb1a1e44b4187d5f0d4aee6bb1f3466eb0373e8af4ca890d6cd65a55a58b05ed
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 10580 bytes
SHA-256: 2a72840f3d36f4bfa5bd0369af030b21e211595df2ba487137c9a9e573f77a4a

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