Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70ddecd0a537081…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 08:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88ad75ffd866d3f9b46cfaadd2c3169d SHA-1: e8ddef335076f942227ad17df60007dca69ffeab SHA-256: f70ddecd0a53708183414494c068e500bfbea6a30453d4b9acc42fd41c7f4a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The presence of these 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 0.9982

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://crewmak.ru/uplcv?utm_term=narayana+suktam+kannada+pdf+download PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7251675276---misij.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/45267668507.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c173b192f1---88315937473.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/47521105192.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/36003852325.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/6282363165.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb928a3e8---mofiwazesovizaz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/950f850f5713c57959b5d7826eda80b0/peded.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/48231476983.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/kiof9ktb3b0jts5c1jjgdnkrp1/99626985303.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ce8787fc8a2d7e05ac28b359627fb5be/76270942434.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/e87cj1gkckv93h5tuj51q5dv6i/vajupiw.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/72469755003.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/tiponanuw.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/8399886103.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095798668c80---roganituxetegivimezivop.pdfIn PDF document text
    • http://rm-parketi.si/uploads/zigarijefuxadodorikoduka.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9jemji8n61h7bm92b25bgaqoj/99062223447.pdfIn PDF document text
    • http://topstec.com/d/files/pukafok.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/69823691500.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fb1aa421d87ac6880974119ad5a25899/butatonulerozisu.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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16364 bytes
SHA-256: 57ba60129f0c33d2045ad3d91b5d4f2e85b485afab1ecf746aaba38ed606dc6e
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 10804 bytes
SHA-256: de8ec0c73971073647576fc2515bc368d5229bd4192ee9dcc975cd84ab0a9a21
font_02_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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