Malicious PDF — malware analysis report

Static analysis result for SHA-256 7badc5538620cd2c…

MALICIOUS

PDF

93.7 KB Created: 2021-06-26 02:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df50f05f496a82bf9093e7facc91673b SHA-1: bd42b42e5f8eadfc01faca81d5b44f210d50710e SHA-256: 7badc5538620cd2c89779f4e72fa3afd75c9c6a11227410d97e4543b95e6395e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to lure users to malicious sites for phishing or malware delivery. The document body is unreadable, but the heuristics and URLs confirm a link-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://kursadowicz.pl/Upload/file/49168866403.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9657656f---mepirunimekonivobiwo.pdf
    • http://adabaskimerkezi.com/upload/file/zewakikofavakisivufebir.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/66365745432.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/34235eebd7fde618d633faf2cab9c89b/66253697133.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/59227588565.pdf
    • http://cokhixnktientien.com/Images_upload/files/perevuba.pdf
    • http://archimax.ch/dynamic-images/cms/file/balinutejipisavugorok.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff276c1b44---jesanovedezupevaxugobexow.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nm3a78uj9l0alp94es83nh0kee/kopogaraxax.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60731deeff35fb9a622819393dc7b729/25081150895.pdf
    • http://landpas.pl/upload/file/64835417453.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b822784ce6e---litetexotadema.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e70877541---togamibu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7cb92293---25877426497.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/85472e76cdf0cebc0e86c524860ab2b3/20968617167.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078083a06f0c---tumuxuzukonepaxezudigowe.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/biduzamuxenawemitub.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a253b268c---tetibujojirufogogarilit.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16099ecb724a9b---jewonubanelofulapaluje.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/08rer6arvhramic9gm1iq0lgv3/15279853563.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070572ebcd0d---15299927897.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d7953ec58294980f25de4f6255594b4c/60930069402.pdf
    • http://driver-jazda.pl/upload/file/31843437820.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/25f2dc8e1e2e1df2e96f0312495ef9e2/pokimenevibodafopegamena.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=good+pop+songs+on+piano
    • 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_off00010d20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 16792 bytes
font_01_sfnt_off00012532.bin
3788fdb1ad363b924a01ed347416b9399cae5efd43d8e2a315699a0e30bae64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 17632 bytes
font_02_sfnt_off000152f0.bin
b1bf8bf4e2abe7cbd3153d7619027f082eaebc15cefed75b228820df1eaa28bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 10228 bytes

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