Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb64d8e158e107d6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 23:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 431ebbcc712b8b26d2d084297119df2f SHA-1: 4433542ae966118ec4770fdd782a06d602cce138 SHA-256: cb64d8e158e107d6bb3d3349f475bb77c25238658759c98215433efc87553364
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs that point to a variety of websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or lead them to further malware downloads. The primary attack pattern observed is the use of a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0b1k4f5gjmg5hhhaifrnu87a91/52132209377.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4d01c54b---83637911193.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/840fe96704d6a8453ab7db821af07567/94030067489.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/tizofufu.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/bugudojasowid.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/4470633888.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91292e1fa---tebuvuwiv.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xapuwovan.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/98606394550.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c566567a60---37863723540.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/4466875755.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/nogomebutefowagupaziju.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/fogoju.pdfPDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/081cb171bd35fba3406b82e7e47a7646/gozumowabimer.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/21d2e50b236da374125bae7b7dcc6dca/61432204667.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ueue9md07h866c823utsv0010n/rezivas.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/85220111739.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ikb8kn6cqbmm909ie90s1chep4/33753628279.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/62477099667.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/87992858791.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/jezimilajetujibuparok.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/370f36e833e5b36a1df1f29fc9c73e1e/dewigebotilal.pdfIn PDF document text
    • http://atrsara.ir/resource/files/56506299492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=calidad+educativa+definicion+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 10544 bytes
SHA-256: 5a8a1460ac3ec5c7dc4c791c8424d6e6ffefa4a834b4c7e19007c7331757cbe6
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 19744 bytes
SHA-256: bdc2da4a0cc6266af592c519537f5dc8b71eed72f4043257b9bde8c44e8c4e7d
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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