Malicious PDF — malware analysis report

Static analysis result for SHA-256 f368ed5cf6e1cb88…

MALICIOUS

PDF

73.8 KB Created: 2021-07-31 22:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 58288d6954cb6b6984266f962cc2d157 SHA-1: 67a4a983af9fbf77d264887d34e268e7082af55f SHA-256: f368ed5cf6e1cb881aa0f0af07e2557abf593affda7933a5dc4cc288edcfc43a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7960

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 http://akbarestate.com/survey/userfiles/files/46095560130.pdf In PDF document text
    • http://tokyoto.pl/UserFiles/file/50986812412.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tabexedif.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16092c871cffaf---mijagolizifamovenedone.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/16/file/20210716_155238_178.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/32354956196.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/89074011569.pdfIn PDF document text
    • http://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/44885115845.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/90780746140.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/gorenadiguweselozipatowo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/zotemuzebuzibo.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/nuxexiki.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609851847fd2d---tixujafatexiga.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mrn8ghn620uvl9jbdva1ro0n4c/14892896765.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e0b0036a664e137d4fe13b65dd15e634/dunokebozaj.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff6411b8e---12886220964.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc91e3449---68697198822.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/ponilimibevenusuba.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4f0ea5d95a3bd07745179dcaf860eeef/80312104875.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e42ace95b---mofakowaleripulokisi.pdfIn PDF document text
    • http://intergeored.com/upload/File/8207625020.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210724180133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=irregular+verbs+list+exercises+printablePDF 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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10788 bytes
SHA-256: 43f1f06452fc38e43b69c641f822c40d5ce3818f4a6f14150601c5e4bc1b905e
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 17300 bytes
SHA-256: 31382ba4000deaff3bd2675e1d7116ce8609cfebf343a083d7b7c89a33908045

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