Malicious PDF — malware analysis report

Static analysis result for SHA-256 492d2cec78b2696f…

MALICIOUS

PDF

86.2 KB Created: 2021-07-23 19:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 664a2ec92fad85a6067d9ce88373996b SHA-1: f7d135dd3b54d4bc2ed2ed29854c9dc845b73ebb SHA-256: 492d2cec78b2696fd33b6083abd9870951858e047f8bc6036d077729db4cd9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection suggest it may host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ef6bfc8d---bafulutolesikogexezuni.pdf In PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/25904753661.pdfIn PDF document text
    • http://stylekd.ru/files/temipugozumaperakubaka.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/43651854292.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8c54cb48e753b41bd4137189246a3154/nujebesu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1cfa7c850---pidiwidomimivunib.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/fafugi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3f7ab8a8---kopazafilubewunonifefi.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/rifopavate.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/jijatuzekexatumabaxo.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/jidavenawuk.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/918ee8bc98fd36088760881de97c48b9/94561151598.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f567b4847---88243121457.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607853aaf01f5---221895543.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a15c2351---bizejolifogakonomofujul.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/20454933225.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/vefeginenewabika.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210716055437.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46e06a970---xumewiza.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/57323786970.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d928b587---33643544424.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/tufifazazalekaxaguxife.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/49457469211.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160810f6db830e---kasagawe.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/95178505858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=imagenes+del+abecedario+para+colorear+letra+por+letraPDF 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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 10948 bytes
SHA-256: 9ebaadebaac0c734250fae5e0cd24054d0ec9eb31edc39ab46c04007557cd951
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 18088 bytes
SHA-256: d3376fe50919df6e2df9593c8c6048b06534d7b0a1ec372059fe5403f4469075
font_02_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1