Malicious PDF — malware analysis report

Static analysis result for SHA-256 801504ad40d048f0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 16:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e50c93a8f71eacd1ec89f737db8a6bbe SHA-1: 8a20425074cd5cf21ce090561f67d166e0e1fb6c SHA-256: 801504ad40d048f05451a4b261a0c178cd1e735df59a5ade9d70bcf0777f8c66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dehayemek.net/upload/ckfinder/files/kakevajisafajaduje.pdf In PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/xiraropidemifitudedu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/zigozija.pdfIn PDF document text
    • http://ud2-140.com/files/tosexavew.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d20ab15cfd---mopaxub.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/17174854285.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/88356616057.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/pokijufirunasopinesigikur.pdfIn PDF document text
    • http://p-energo.ru/content/file/jowaxoterufun.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/repuxetamogu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2b8r43a7nmtlosag8kf3hcq2om/tubeg.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/30372519188.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jomoz.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/502affb086fc6a660d68fbcd9df62c26/84372189116.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/tokijeti.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/punijononu.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/defimijewu.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/62177743924.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gejezozusepinowidivup.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/tawokol.pdfIn PDF document text
    • https://12tiga.com/contents/files/mavolijos.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897ea8b66d---vakos.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/puzipupusemekepe.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210920_215955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=past+simple+and+past+continuous+test+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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 10780 bytes
SHA-256: 410effa732eb77c2229738f3650cb5eeaa06e13e66a469c01b21487f7d98a939
font_01_sfnt_off0000cc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1D 14792 bytes
SHA-256: 631dc4bfadb0de9c76bc5db62b4528735912a06bb1a28f468b22ee9857f1c6e2
font_02_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1