Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25aa8e1f5eae868…

MALICIOUS

PDF

85.1 KB Created: 2021-08-26 02:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a735e5a3fa8ef54455bcc0579a7629b SHA-1: 1a46f0ccb37baeb2f7c630b9bda7e3f2662a9473 SHA-256: e25aa8e1f5eae8689dd4fbb7de18ad99c2575913367a614f398761cc429660ad
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eternalbliss.net/file/fapivejabida.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb292727c---75772320440.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/pebawidi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/bipepu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084496da6847---wofoviresegazexuxa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078959ea3a46---febalodo.pdfIn PDF document text
    • http://umhouses.com/uploads/files/fadivulafolowakew.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/xalezizamemamokarikefona.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210731075807.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f6280e7---boreve.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/30309234547.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/mepujakigovev.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/96413928606.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/77308910701.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aafnk82s8ajaupcpl2hdc6kcf6/vifed.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/sojekigakoxijorujegi.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/xemotefusuriguvasumori.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/bekaketuvotajewenemevoti.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097daabf32a2---dejugavewidufirapajibo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/80f033f5de4fdcc341f6da795bf9e473/60759444099.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/lafitowadiwitorisonig.pdfIn PDF document text
    • http://allasclub.com/campannas/file/11480462251.pdfIn PDF document text
    • https://hssanesteban.cl/files/sonebejabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=merge+pdf+selected+pagesPDF 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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 18068 bytes
SHA-256: 6821ea2fafb49b91d539333b6f0c57d2f530b2c56bcdde97cf89c1089cc0778b
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 10472 bytes
SHA-256: 45c4544d289d6388fd34a7a919a588a222d1d777c4f65da528ac691bd48960b1

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