Malicious PDF — malware analysis report

Static analysis result for SHA-256 684cc6631dcb7cf2…

MALICIOUS

PDF

119.6 KB Created: 2021-06-26 01:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: abb67072f75180bb49ee7a12ebd53369 SHA-1: 21330bbbb3518d2f1af9d036c417e332311eb447 SHA-256: 684cc6631dcb7cf26dc926dab3b80bd36321feb07fb188345446c27f0f0e9f45
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the link farm structure is clear evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/18bf59167bee785d5ed341d271638b3c/41629263519.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d271b0d6d4---jedurubowididimatinu.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fedisomubobipaxemi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c9753a7a9ea009280277a36a6c4cfa34/71336950682.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5159ff73---temibijirolatarawusuditul.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc4266276---2693595041.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8nj90a88d5j907ihkice2cgv6a/povisoko.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/saxinusexiwajitakejeferos.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecd1f16fb---64241112064.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/shtnin1gamm3pq7dj2q4rrahrq/33917372931.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/80020f3b0415c58a19435df97bf24074/fugijenuku.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/16183892088.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/82283484962.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zerabanizeradoxoxibik.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/46523847381.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c32e7f65f---fobadog.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4viod47dpb9tv3bd0speqnivm6/38744935090.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8a8a286c0---70055197370.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf33392635---64049604357.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e17c353---jupomekebemojux.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qkkh69e8uhvepie7ue5fj7jo6d/42173787899.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b7198380---pajerotumaxuredomi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e94e7225c5374ccb3583eda2241eb00e/80117127038.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1cbb6ed876a784127700c0571c8669cf/47042834479.pdfIn PDF document text
    • http://quinta.cl/upload/files/tikawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=two+sample+t+test+hypothesis+examplePDF 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_off000169e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E0 10580 bytes
SHA-256: 2e6c060e6d138f4487ffd510c55b0e18233ef5186cdcbd06d1c50dbe6d81917d
font_01_sfnt_off00018226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A38 21392 bytes
SHA-256: edfa7276c4fc4d7f2f40a42486a7bb94628b39b8881a108b84b1674122ec830b

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