Malicious PDF — malware analysis report

Static analysis result for SHA-256 552d2543a4af1589…

MALICIOUS

PDF

82.3 KB Created: 2021-06-26 02:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e505bfddfd8344dd283aed715c97168e SHA-1: 23962f0a82b5db6996cc941dfb14a3db9b3bcb7f SHA-256: 552d2543a4af1589b734307f64294217b5ede9a83e85efbf3c89a966d926375a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting sites. These sites, in turn, host other PDFs, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://supermagnum-bg.com/ckfinder/userfiles/files/5325786076.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vueqmgtc5npimil37g9ud198r8/fowopigaxudetujowofigusiz.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21382afc6---jotilarejovogexawoxedilo.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f2995b5fa66eb5a4d36e9626ed98fe05/senifatuke.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a181aaabf85---dutilizi.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/304601206b63902edc881a6eb06017f2/dugarozisixapap.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/eovig0jf1ancu4379g8sc9tedm/toxevizulabevovubor.pdf
    • http://dnepropress.net/files/file/66662719479.pdf
    • https://monyetjoget.com/contents//files/63979218594.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5f3c637bee8f4f92a958187069d8e6b5/31396026646.pdf
    • http://sport-way.ru/img/file/limemumisejuvujat.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a3e4798cc83b51b28a031003d8861932/jemeloroke.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0d0239c33fbb8ada2f3d1e3c5e7a3963/58803979476.pdf
    • https://guineaservicesproviders.com/gsp/files/34218344142.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160899945488af---ximowa.pdf
    • http://tubietelbar.hu/uploadfile/60370842027.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e8a7b290---92048668069.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3937933f11---bubexatetidi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085195f8e28d---31208073586.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0062fe3df70114384d16c171f107dee0/bupafunizinawugosidek.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pcabjlltkggt6pl1lkngh01gr4/figozuvibeki.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2jk9v0tdpd5tp47dssh93kj8e9/vojuke.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa259e951---34240128368.pdf
    • http://okmarin.ru/userfiles/file/45712479136.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=scary+scp+096
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4de.bin
eaec58c5cae3814329dd6d5891c6c23c05acd32af343263f453aff601bbf4b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 2208 bytes
font_01_sfnt_off0000deaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
font_02_sfnt_off0000f6bc.bin
eaf548f4e6e5c6356d4f7db8d71775da44573c16a1f7601ecdaf7325d9883c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 17460 bytes
font_03_sfnt_off00012415.bin
546d69d2d82f33630e7093f3a8a4f68af48afd170cc0f740c075eb4ec31abd55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10424 bytes

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