Malicious PDF — malware analysis report

Static analysis result for SHA-256 248855724f77a51e…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 04:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e542d1b0e62c8fe3a5472ea839cec4b3 SHA-1: ca2a25ec15f3aac544036285c15b48d041cac0ec SHA-256: 248855724f77a51e768f0764b77d317543b2d8d51f6335efdb58c1e27339324d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://atraba-holding.com/userfiles/file/zevunatifeluja.pdf
    • https://genegurumiraclehealer.com/userfiles/file/besukigakugiliripen.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8ca6f8a6a9b4a6f015511688255e8af1/xijiforumo.pdf
    • http://cesishotel.com/res/wysiwyg/file/19669780799.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855cbd29902---88317521610.pdf
    • http://apsencollege.org/test/fckeditor/file/52805727022.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/80cc90ed81e823e112a3016892fe7879/zikamabumedutamobam.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/429565dad5e6d9fd30bbfe3594b1d85f/muxukebegaputawudi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ce1370eb---tanasakipaxova.pdf
    • http://africa-emergence2019.com/userfiles/file/dosavegemokobi.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5efeb0a32d9b41b9350b179ccbeccf0c/lurisimagemolenezif.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2dff89b6ba149786c3d7d5ea159dd8a1/betakus.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0478199fdddce4d1b049837fcbc383df/6751412265.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d33d0dd5d58---28921688564.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b843b32c1---bubekufalexevopitubodag.pdf
    • https://bamor.org/userfiles/file/59760743563.pdf
    • https://allmassage.net/upload/file/20210601043629.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49e9eaeed---62808849318.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s1it3du0ilho1esi7aftpcm9ei/xurajarapewogaxilutaluf.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/jbch2q9tbikdqollb0btg4tg92/61945442298.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8da74a5b---nadazesenuwusafilemenu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/akvi3jec9ppngangkjc6nir0v5/37102356493.pdf
    • http://matsonconstruction.net/userfiles/file/pimigosinikaruvigilaru.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9850628da---38746381426.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/39740689976.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=house+of+the+faun+mosaics
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78b.bin
54e7bbce650c055358c8409cd239b16ee44cfd1966429fe6789aa77661f32aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 17552 bytes
font_01_sfnt_off0001252e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
font_02_sfnt_off00013d45.bin
2e9d95d041cb597f85a6ae54753ae1bc3f991f0ea4a11be477e0742419d37e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D45 10544 bytes

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