Malicious PDF — malware analysis report

Static analysis result for SHA-256 664db70133967fa0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 16:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6439758cd719fb32020822fb3da65a6b SHA-1: b42cc57479172a32d885111cb68d4a8b6254619b SHA-256: 664db70133967fa04815ce8532a6486906c0d99de0ce62a585b768cb2fd1a4ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://sangiorgioautoservizi.com/userfiles/files/vekobupuvutaz.pdf In PDF document text
    • https://machinex-machines.com/UserFiles/File/finefaduk.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e761308e---najeralegusegawad.pdfIn PDF document text
    • http://parentini.it/userfiles/files/sekomugamuwituzosowi.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/83631255017.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/31404680370.pdfIn PDF document text
    • http://veitali.com/upload/files/34215066811.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/12043748909.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/76795077920.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuae6lhanker0ded15g4sjbio4/zewewo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607897439daba---mividurobujibubukedir.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e06161a4a---ritilifuxujozawefusite.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/segunon.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba3f5d1e8---bemumizizutaledoru.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106200445021906.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/sixigazelokuvanotowokazew.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608873d170357---juzujajugegelesajud.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2c0b229783940a0a365f18728011a4aa/lavodujumozevexilutud.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210814233621251.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f404231f0c---14605230301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=signal+integrity+characterization+techniques+pdf+downloadPDF link annotation
    • 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_off0000ae0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F 18296 bytes
SHA-256: bb6c824379f91d63abf28079f4b7b6a63559f2490d88c202b482c1c86a99eaee
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 11480 bytes
SHA-256: 07274503b0253e33152e555620596843b9caba6fec04f3de74b197a930530932

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