Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f47be867177ce6d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-06 03:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 015be2a5bd2b5182d01a74cbab99d8a0 SHA-1: 0e5398370913ea580b54754b2f5d63de953a9323 SHA-256: 5f47be867177ce6d01a0322d206585e138cf977e91666fc0aea3d7578a1bacf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the structure and heuristic firings suggest the document is designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89abd7782d---toneluxujadisewat.pdf In PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210719_838FB4347DC7C174.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec45a788b3---17488533142.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/xilexedoxifapisazem.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3929884152.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/xadomubez.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/dolurujekazufaxer.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef7a704f32---taraburasigej.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c201872eb6.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/312cee541541390f6602af80f1a11d91/64479300764.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jujotemano.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dpt7ahbsns26hihjqmbdiqd8vq/sizovuvagagevegoruf.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086e392ce686---99553063567.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/75e1d6de29a53d42d34a1e6704478c69/69740816111.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kuvoxawe.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31aad8a0ea---75937217133.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sibegomipupuj.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16071415140917---50640767108.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/kimakukaviluwikanaga.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/61878919129.pdfIn PDF document text
    • https://limsurdua.com/contents/files/febizesozobuxanivogoxabo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/zirasumusevozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36bc43f28---54883808370.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/derezilirifarapokira.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/jisufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=c%2B%2B+network+programming+tutorial+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_off0000b2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 14444 bytes
SHA-256: 9f1ebaddcd1bd4aa90a1f275e3a3618878e3c443dfe3de73323ebb0ca204f62f
font_01_sfnt_off0000d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65E 10980 bytes
SHA-256: ac31f03a4969732cd53d60f39be71d0541ba9eef9a2760238bc08d01f3b19826
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1