Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fff1048b7a1237…

MALICIOUS

PDF

91.4 KB Created: 2021-07-07 09:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f1a46a3d579daaca6a3035c274d103f3 SHA-1: d39e77331b891716d2b41fab401981f694aada00 SHA-256: 77fff1048b7a123701252144fc14cf3a62da7fb6835ca74cce868bcf2e68491a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the compromised CMS upload links suggest an attempt to leverage these sites for hosting malicious content or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a098da0c---28465086147.pdf In PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105242317490796.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/wekukenomirisem.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/57182267323.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/solilenexaripanejaxamaw.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08ded73a8---pogurolojadofosi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/31421714659.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8aaac226---8134480661.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/favalozuterumunubufubizo.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e2bef0fc31a3885230be73a2cf60a20d/fikimekulawuwafepagime.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03919325f0---bulal.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3329ce5319ab3f84f8654e86e5bd05c6/tesuzig.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6f855abe---17488852519.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8031d649---46078489771.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/dapulewipadopowopudarawi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/mefubizemonilotokaji.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb57cc48b---lonosavuj.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/56445783677.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/17226778695.pdfIn PDF document text
    • http://congluc.com/upload/files/1281609311.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/galipafeluto.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/77330340507.pdfIn PDF document text
    • http://teplospectr.ru/images/files/96355840557.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3425631af3---46757887203.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/5253642702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=project+free+tv+ag+unblockedPDF 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_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10920 bytes
SHA-256: 8b7885bc1239617c89123372cf9f9c4c8eed00c191ebfc845a74662765f15521
font_01_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 16412 bytes
SHA-256: 9c8c4f8519565320bef42e540215072b59d6f46192f7688d97f5c92f453bdd41