Malicious PDF — malware analysis report

Static analysis result for SHA-256 c887e186fb9f8cb2…

MALICIOUS

PDF

71.2 KB Created: 2021-07-06 01:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e1d3d4ee0a7e5dc44359f364243e5a5 SHA-1: 41c4da44a07896310949584d1fcf2d69f07e2d10 SHA-256: c887e186fb9f8cb24eab3323af8ab27aeaaf3bfec1f5ba9554b1ea9b00fb9d57
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. Several heuristics indicate the PDF is a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to direct users to malicious sites. The presence of multiple PDF link farm indicators and the high ML score support a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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
  • 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://nomylo.ru/uplcv?utm_term=two+minute+step+test PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c91bf38a---silitovu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/36801331696.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/40017678920.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/254359969d31a72c0489d04a1b5b7337/lekokobak.pdfIn PDF document text
    • https://samudra99.com/contents//files/45403716657.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/35821108803.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e169cbe44e---tugeporejog.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/32644050699.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/23487117825.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qeekfci9itkfqaarj5sivi6tc7/40808340110.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/35104774981.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075903b940e1---53566494153.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e6901781bb25430baf4382f1cf657799/tanelobonax.pdfIn PDF document text
    • http://poorclarescork.ie/images/sezojovoteporuvoforuw.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/gipupoluzitoz.pdfIn PDF document text
    • https://triosms.com/userfiles/file/10293617493.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/47051890935.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1f8b146a---71190864675.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3c3755f3---54370229869.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160759315641a2---14476109319.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tobixagiferuxigiripizugi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59eaa465f---90935976660.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cae7ebbcc---kaxifawubokojidomotu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3fc64414fa35bce15001e48b6d0602c5/buwopozefesodi.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd56556c3a---jiwoxugadusom.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882126ea979---bizudupuwatolojobutewav.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/2580924582.pdfIn PDF document text
    • 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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 15008 bytes
SHA-256: a3e1447302a0a74d355004bf391329f19bf85f3d6127a0b83d8525ef45707000
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10252 bytes
SHA-256: c02427d186977814de805d0cea8e4b169f3a488df01f3ad60686dc7c6ea1581f

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