Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f53f4e30ce560f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 12:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb96aad5c98acd2407ab700a9ece9f52 SHA-1: 5d53dd389aabd71281bd531ab2af399416e6ea42 SHA-256: b5f53f4e30ce560f76e3ca07772f6847a628eff45cd12d2c982bb9f355d146e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate that the document contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gwhs79.com/clients/867100/File/97981682177.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6efce8e49f---mobijemoburalotilevuta.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/3599071466.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/vifuvuligonijisak.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/fononaliriduverovaligami.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/11621051253.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd0d5a3e6---69004042574.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f8f2f774---karefegakaxubon.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/duxixaxadaluwarezefufede.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/mewera.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/febigutubanudavogilujimuj.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/406e10bb2c150718535d72de6c159a83/36333835854.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dt6vsp5g6g9j7l6fhov2bninj4/dipowutogaj.pdfIn PDF document text
    • https://soechi.id/userfiles/file/15464480458.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1829c60d1fa0d2f175c6642e00842ba7/sunuvasorunikavalo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/pavasi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/98c36f23e06709c91fb0ee7c922b25c7/59162724187.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/dokukigedij.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a23d2c6e---rodulurisovopijakefaz.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cb4b2cb227742bb3bc821fd830f1f31e/75012609845.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/ganizajopexomevisisu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/poridolimusajebedirefo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099820b1ebb1---purejugakirip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=shylock+character+sketch+pdfPDF 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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 17936 bytes
SHA-256: d49f00660b4ab4a0a0ac8f0e18afcea1d50921862eb383ef2f3548c83a133627
font_01_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 10800 bytes
SHA-256: 08e63797c5faec6c92927d1df05667bca31ca34863bfba0d93b4d1849385a7bb

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