Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f0b773cc9cfb59…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 11:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8531b1952c95b3151e4e034bbba921c6 SHA-1: 5ea45582e212f6e0c1c532f6ff09ed6e7d974562 SHA-256: f5f0b773cc9cfb5994376ad064c0471acdff0523a9aee1b57d519f798ec447d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mygiftltd.com/userfiles/file/tonunujorotelekozamoj.pdf In PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/32514923015.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/navibakipadipuwute.pdfIn PDF document text
    • http://mosjob.ru/images/file/55323465846.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/dodak.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109052246208823.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/39678161429.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e29c18b831---83717486947.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vudinus.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56488385097.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/gurimivamo.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/45293804915.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/vosimapalogegixid.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/mexib.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jukaxakaxaxuxesikuno.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7cda82e1---kujukowexokefebe.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wurusepevogufa.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109060656223939.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/55e39d117650e3e591753bcf656367be/vodonowipefugojejar.pdfIn PDF document text
    • https://duvanco.be/docs/files/zijibofenazoxixesojelufu.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/87013570904.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/49057554527.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/32901926738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shadow+fight+2+max+level+1000+mod+apk+downloadPDF 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_off0000b18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 11392 bytes
SHA-256: 910536000fb2346ac6758b11d1866d4104fe37aafe97a720e73fa9f32dd0635f
font_01_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 14756 bytes
SHA-256: c388ccc2a13b8cd89b315a324ab5f47db470de817c31f6ce10b69bd3f616f65e