Malicious PDF — malware analysis report

Static analysis result for SHA-256 928f7e15d793a028…

MALICIOUS

PDF

91.3 KB Created: 2021-07-24 17:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df915a1dd99a461c98124ca4c5e2a287 SHA-1: a81a4db9710cf62679cb2c7d3f22b805513095c7 SHA-256: 928f7e15d793a0287fc075940ba479a0a06f1dd8bdec6e9055db472578beb8f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links, including one pointing to a raw IP address. Several heuristics indicate the PDF is a link farm, with some links pointing to compromised WordPress uploads and disposable hosting. The presence of embedded URLs suggests an attempt to direct the user to malicious external content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://saikunghouse.hk/userfiles/poviroj.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3bf8bd611---zomoxamemunejiwezul.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/23461552235.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/62365154443.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/senidedofo.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/17253717641.pdfPDF link annotation
    • http://maristaslardero.es/userfiles/file/49496738727.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/89820550130.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b278e5249---fisapumilajidapogeg.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160710ad701039---68480056706.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/jinasejupomexetuposikifo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ef986cf9---soxaroj.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/gidapesafo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607148e57e71c---2143183369.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/27928201798.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93446b5cae---nevameso.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/86877032270.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/nizejumiriwige.pdfIn PDF document text
    • http://guitarenko.fr/img/files/luzufurokemur.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611033453795.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3678d0dfc0---36822549572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sixth+grade+fiction+reading+passagesPDF 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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11032 bytes
SHA-256: 6628afba9aed1ce02ea52a7a8edd5fe1e8f9346cf749418c6e0f1cbc9d894253
font_01_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 17176 bytes
SHA-256: 958d9012ffc04ec609df0bfcb12785cf25967820b42af1241c94c6d5989aaf1f
font_02_sfnt_off000146ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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