Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ea546cb9a77ab1…

MALICIOUS

PDF

79.6 KB Created: 2021-08-24 20:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37b0b111156b42126a95560157975cf1 SHA-1: ac3a1886227d47c6fa15df8fb422ed79b45f03b5 SHA-256: e4ea546cb9a77ab18ae3a1b48bb41fe545cd282718943d1b20eed6c5d1156bb8
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised websites, many of which are hosted on WordPress installations and utilize form upload plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71eb90b55---81239439457.pdf In PDF document text
    • http://ahkjt.com/upfile/file/61995929050.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/41850bd185c528ef271076a431a4df80/41159285824.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161041e3704e6a---jidezapataxavejero.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/rozuxarobifuk.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/ponufusowasosajuku.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vilevesirulojenomadew.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/12479757497.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/refawenukikunaxitegupuj.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210803121805.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/kurin.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/belijufezuboforofenevesex.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/26188687.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/zogan.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160850b2d52830---83462538296.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5a42f0c0---tawomisimumilep.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/wigonidev.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4m50dcveems8l6l05lconirs68/sopexowij.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41ec9f95a---netapagonakegeraro.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fabc1ab252a---47763379265.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e8behd3v7l1srfi4aa7ogg2g/80282548399.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xopesolawijuz.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sovobaxekiwubesusimew.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/79097290001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=both+teams+to+score+win+tipsPDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10732 bytes
SHA-256: 578370f0caecbfa7ba59846bdcb9f369ebe477c738644934203233ea60b1642f
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16584 bytes
SHA-256: 07325fca3cdecc429bd925b13d1fe9ecb19c32c5c7019abdc25c962bec310b38

Open this report in the interactive analyzer, or submit your own file for analysis.