Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc79a8750f08d1f…

MALICIOUS

PDF

200.7 KB Created: 2021-07-03 15:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8895640db818bd207c7aaad6fd5c1c8 SHA-1: 242f901861b17a636f3126e76dd10a723ec23d14 SHA-256: cfc79a8750f08d1f9b3c174cf7c283cd4b38c25cd4517fd1987f39c54661f58c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The primary attack pattern involves directing users to these compromised hosts, likely to serve further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8931

Heuristics 5

  • 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.
  • 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://celebicatering.com/upload/ckfinder/files/62883387172.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609780c0a30bd---dokexedekulumefa.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895643ac0a---57903652681.pdfIn PDF document text
    • http://mav-auto.ru/images/file/jabug.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dbb3aa4fb---96542624689.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/35709559674.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/fbf77808c52ce9c4a5ed5de005211645/dozadorujunesuga.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e028d3157---zutewanosodezetaruliz.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/wajij.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/71186679952.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b8cfc6ae8e1ee6621b4efe924abdfe70/99579929798.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7bfb2210e---2835264650.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/3c5c753fdceec9e3880c4993c1a5bc0b/44770744850.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1215c2f3f0---jiduzibuzewujifevolijut.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be80e85408---89150205480.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/193114edcb2891d96fd136672f9ed584/23412482808.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/90f695d7d920a3ef58ad4d3af253ffcb/tipiponubonomebowenobe.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/39a9327016e68a965bdd24eb7c172561/xonuzun.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1b208d21---rinuxokupazukisobusere.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/a997v5rl1frskdgl45up3ogdu0/tavimojoxulojen.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16245635172097784367.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/duvakixoz.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/mobaloje.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/16605719580.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc613c6186---rowujufefiselezifabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=center+of+gravity+and+moment+of+inertia+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002968f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2968F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AEA6 10836 bytes
SHA-256: 1a791e7401a328f49d1cae1ae9699ba6871bdb22f38aa74c5102eb12914d7c98
font_02_sfnt_off0002c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C780 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off0002dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD18 20876 bytes
SHA-256: 08e8cce113038459bb3b53dd38c838eb1ff075a978be541a68f6cacbe591fa25

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