Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7dfc832599a17f…

MALICIOUS

PDF

66.5 KB Created: 2021-09-01 15:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 181c317329c2091c7db80856e3ea0720 SHA-1: 483e8a433b7efbc410a39b25e36f76d0825e7b41 SHA-256: cf7dfc832599a17fb6a429a71f8e3a45b85be35b10cfc6a8b1c2a11ebae41f9f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

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.
  • 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
  • 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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5155ccbf6b9e7033000aa9ffd63ab02d/vewufuzaxuvudugogenulokug.pdf In PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/gisotilekur.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b282dfd9305---xopiforakovevof.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ginirewalafevadirime.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/90086656191.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/r1bla0akd4nl85j9t6fak1vhp1/17849480813.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd88c308ce---jovewosofamavaveg.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/46710701364.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sejokijorilatifofogiz.pdfIn PDF document text
    • https://efnnma.org/files/file/muwakinisiluzivunob.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/najelukutodudosoju.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f0641bc5a5b03541a5ab6c9806fba22/97875662319.pdfIn PDF document text
    • http://www.andreapondika.cz/file/vafukajof.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/pudaxabovezu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/74b95a1db331927610349c70f39a7a4a/dujuniwufajalatekotonom.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100d72259016---pefowinepoxoze.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/rurigadovifetet.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/v2k3m1vg4o801belc8mhsa8pn3/ziroxofipojadujijod.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/zijinabigabamefirunuso.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/xoxolenoputub.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/58296186525.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8f8dff1f9a916b8ffdf764b72ea0f59d/mikuse.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/92186156799.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0e396905---33538802539.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/044b157f92a93a448ae624d49598fc7e/pifiremutov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wren+and+martin+letter+writing+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 10632 bytes
SHA-256: 743a99d3693dcc3a360872543faad1ddca3e58163fa5ea32525abd58d8d2cfc0