Malicious PDF — malware analysis report

Static analysis result for SHA-256 e619e43f18786557…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 13:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5d74ef3c641d3149ee3d2d27427603b SHA-1: 1292d82f41af5dddb9d39640c8098655d5a2084c SHA-256: e619e43f18786557183951c38d37a4f43337b61d1dbca94c6adf2782d4e6b759
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://iehyun.com/editorupload/file/53008530494.pdf In PDF document text
    • https://ferropula.hr/files/37091214160.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/52de7a344722c22b9000a53fa2d57acc/17352891435.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/wokuretuzagediruv.pdfIn PDF document text
    • https://webhosting4.net/media/file/12974175143.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91573fc23---timalop.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/4459472232.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/jaduzazedejonofis.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/50982570255.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f889e27fb---13431145745.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/75322610777.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/romesapumorozesobefatap.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e05237541---13458420636.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/42a3a933fad6834374731840d892189f/wulawuvavozanuti.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/muhtnttunn61nhr5en03uvh2l6/62463201414.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/49167166732.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a50aebff0c702161b90fec408660f526/botijip.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/kavetatekejurujubowoxu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/28799436501.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/rakujigevulug.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a2b216de2---43208363789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=eyebrows+tutorials+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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 17432 bytes
SHA-256: 744cb6f4a168a0c8154f24894f4872d116ca26b912d015be8929f356b5bbd88c
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10812 bytes
SHA-256: 96f6872a4b1dc7592468af7155d0ab72c2051da2bcf18577371be8a3b00ed893
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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