Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d653175c6c17ae…

MALICIOUS

PDF

96.2 KB Created: 2021-06-26 23:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31f0e3fed466a234d478dbb8d8c1ef76 SHA-1: 3d5d95ce1d235e06eeff34d604bf8c36e10baabf SHA-256: 55d653175c6c17ae4835468aec1523495fb7c7336c1e11de64feee372a2bb62e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious content. The presence of numerous external links on disposable hosting and the use of algorithmically generated URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cv2bdlr0bsfgpd5tjuip5s7npp/45071369792.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b663bb04d---fabasojoxoxositivad.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48e3a669d---jumomapixetuxosuwirubob.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b112366974d---varenuwuwukomeviridita.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/meratebisozopamosasuputa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/20d70a09a04350554ad205fef527d27c/sabudelezi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/98352387505.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/caca58179bbb8a8b5f0722a1659cf4a9/dofavawufigiwuxaba.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/luvudo.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210603045721.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fifomudodi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3j3lpcad2pkqru32vq7ln93gd2/60195635030.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/51401753072.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///75415760670.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/juzobeni.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/2054315778.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tunujovaketipapo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc18749b7---78309562741.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cd5b8911---43153411181.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fakiwezisimerarogumebow.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/8925fddc1bbe61cfdf3e534be696fd32/99381170220.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1f7206c65---sipilifisidufumala.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aae5341e5---33649904298.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/eb34529cf23ee167b9bc325c0f3b9fa0/43127433773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=a+frozen+flower+did+they+really+do+itPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10524 bytes
SHA-256: 14a785503b279a4fd2190963b27590ab00a1e17bdddcca383298b5e4246ad7b2
font_01_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 17592 bytes
SHA-256: 526f4ac8c16693642646d087410700d0e9acd438c3eb34ebae907dc82fe117a3
font_02_sfnt_off000144cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CC 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00015aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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