Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40af1a8930c79f8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 09:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19447a4be4e65ab52b99abe17a62e435 SHA-1: 73157b51eed646d22817074f6d71bdc8a0178fdf SHA-256: b40af1a8930c79f891896fc7f6d2def47276aebfb80f16f3d1f6b325b46a7b06
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. This technique is commonly used to distribute phishing content or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c76d3e8dd029b3672be27f48293f1679/patiw.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c0a53f6f---sekivanusoja.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/97f984e0d11980817ed53fcfee143210/wofofevivawuduvefejiv.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/j80vn7vob19veo9ubqklah59rr/94049214847.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/29094334122.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/56db5d266b4d268a2125bb8a4b02f6dc/xezav.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/pajaxisitosamebukako.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/82190008440.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/rofuxawifubodikokisilopa.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/tudisage.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cfb1d56a2909786bc8bd25e67592cbb7/xoseserojazofewategitalar.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8da36c843---74898278919.pdfIn PDF document text
    • http://atek-ent.com/upload/file/zurura.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/raporixu.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/6157007710.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/r4j873od9dbssetm7inc7vamu5/31318802992.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2lea0semsgn1e23vanlg0h7m61/turikerofonedepekamaj.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/56762500673.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/jupijiziredutixar.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/95384489278.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161284eee56d41---58949777948.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b7c1e37de---patomamofavemosofexu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c5ni4fm4vmmcnl3nvjd0s47kg7/80757172263.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160942c95f22ab---59088474890.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/81405274133.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a9b1d987f81aaeefa52c4eb4fcf312c/32689057766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bromatologia+mendoza+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10784 bytes
SHA-256: e451e4e862269412a1c37fd1138b30ba09c53f66b3fd4c80c420c3a1b443cad4