Malicious PDF — malware analysis report

Static analysis result for SHA-256 028409e616564e6a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-03 15:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd1ad3c5e90c1d286ab7e172b196d80e SHA-1: 78c73bfdc22c342993870d36cb4d0954250d2912 SHA-256: 028409e616564e6a8a798a1957c76937fe32888d092efe3507cdc07d21bf36a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The document body is unreadable, but the heuristics and URLs suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://gianphoiduyloimodel.com/Images_upload/files/vasupezizakapev.pdf In PDF document text
    • https://dpmceramiche.it/file/66998854842.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd62ad76540---62126702242.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/70507970221.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9d0b9f61c5d52e7c18400ba1d5d25062/1959426850.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/zokotarasegofozovoserupix.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/50671331968.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6e11bqfeuk8kitdmbaluftipkd/18412432180.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/bejelufizurufirelivapoj.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d38f67d3ad---ruzedajoro.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/mumunef.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapofawuzevobidaw.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210716_5D1A62EEB8C17FEB.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090d22066ba2---76075652809.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/50744774295.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e9556391906---sugorepisamoseweva.pdfIn PDF document text
    • http://ligneus.hu/upload/file/86022194611.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22d0877e2---lobavodemupexugalovijudas.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a177f65f69---dazotab.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b65a4854---baxovuxori.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/17264833901.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/da72f26869c5e6070558f70a6c192199/47677998238.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081352c581fd---91411486513.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/delosekarise.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/gaxupibugiwojaxubafuka.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/vavuvorixe.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/21580032105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=clinical+pathways+in+emergency+medicine+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_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 11180 bytes
SHA-256: 7b3ad86ad05ec7c2890b8396e6510c47c8be2355e1b92cb28a49c61800b66366
font_01_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 17664 bytes
SHA-256: 81c6e2a3d1a285fd0ea89c4ac0e261b7f150ef800af0ce5c9db5e8df152ee982
font_02_sfnt_off00014a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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