Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3571d1637f89cf…

MALICIOUS

PDF

83.0 KB Created: 2021-07-17 05:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a49ffc6f79e37e82c88e529976d1c93f SHA-1: 028ee0e212f0f7228d180f38f83dcd020b26afbd SHA-256: cf3571d1637f89cf6287e0716f01ec2a57e28c75d27c986dc22da5de8deb1fe1
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a large number of embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://delvalle68.com/clients/54584/File/39100079533.pdf In PDF document text
    • http://a-kamen.com/userfiles/file/54551212253.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/680ea5c4ab11569d2f39f4036dee990c/10636494222.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/41653879349.pdfIn PDF document text
    • https://dcimx.com/files/kedegakesujifazagakuxig.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8f3fd4f886b6c687328ad082039ac7f4/vizepidasiti.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/luwilapesorufonutapax.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/92292465024.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bab030e2e---10792624803.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdf4252ed---59492690365.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db3d42d5c---wusagelizopevajibubure.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8623364270320415fb25dd49533a6d46/63992313360.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767d008ea64---17273768022.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/4g8nm72n9juf82e3hl24c6em2f/25667356207.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607866c5c172a---guzadowumad.pdfPDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/224fpasksqs85ts84pk6j44bii/guvadarimepirilu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b86ed4792beb19df13c890e0aa88ae3e/51777061403.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/76217638151.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/wofiros.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pisapidajogasapuga.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/60299764674.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/k0dnidpbf64iieo01euafd29jm/wigafubotiwovejiba.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/ronis.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf490445c0---nilisoxaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+never+be+the+same+if+we+ever+meet+againPDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10736 bytes
SHA-256: 76c90552916adedd1884ac39db82ee38707beb61af8c6cc529a045e81b361920
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 22044 bytes
SHA-256: dbcd988e5c9c381793ac1b431330963bd21d10b1c66600966b371f3c1ca04559

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