Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff784b40366dc29e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 13:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fa5d89e74aa80bca337ce937e0b72c9 SHA-1: 1019e02afa074c5961f5ab2f06d492dd8475b9c7 SHA-256: ff784b40366dc29ea0dc0fdd8c32f5ac0cd23cacece1b960cce2db53204b9809
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload storage suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://4darchitecture.org/img/all/37327749308.pdf In PDF document text
    • http://theexplorerthai.com/userfiles/files/fogivivigebezop.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/88e2b7fd56943a4f30f049790d939810/93390168389.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bewunelosudagux.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/68760110666.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/wisekitiwi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315c133a363---xuzexasu.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/ruwezajiwe.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/6664839575.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2a8d3612---44295574752.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139d1c77a454---xofididewolozis.pdfIn PDF document text
    • http://ipllaser.in/uploads/95603660444.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zesekatomo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd5f11085---vesudaripekatagofip.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/bufovugekikifawod.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fb4c26a73cff8447fd758e1cb7ecbb94/13219187496.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/7450750439.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/52181384406.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131642041cf1---19347102316.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53909387246.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/82312588869.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/66125630283.pdfIn PDF document text
    • https://red-adlay.com/upload/files/riwigojezufom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+move+pic+from+phone+to+sd+cardPDF 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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10980 bytes
SHA-256: 07eb69cf318ee4249f2ede3306390560896e49b5aeb0547e722e737edff86fdf
font_02_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 18704 bytes
SHA-256: cdb77cd8570febdfad66f4f574f1956e75d2f8aff3b8f42e663e852ed2fe8d53

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