Malicious PDF — malware analysis report

Static analysis result for SHA-256 439af7611247a8fd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 22:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e96c5c159c25fd02d28a421c26a705b2 SHA-1: 90477394906abbed46ef3bebe283b71aec3fa46a SHA-256: 439af7611247a8fd1ea1cf74bf081a0d7da4a2b249cdfe7a24fde415dbae25da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://visualmotion.nl/uploads/file/36916233939.pdf In PDF document text
    • https://cornerstonelaw.eu/userfiles/file/17655264599.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/9610310025.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/wubobuxixadi.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/morigetupoxetitututilu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/14724210011.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/26077175762.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/84226302662.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417506251c2---kurusadozosakesijuxi.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210906205647.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/4581980600.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12886486074.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/17282254185.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/silufu.pdfIn PDF document text
    • http://acelybio.com/upload/files/damebez.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/83447268496.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/wenebum.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefosanomuvumepijuzisitep.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/96090553808.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6r7g0mli8oj0u4hv4geboti7q6/jimofiwuxukar.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kejaf.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/71980712817.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/kevapol.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6535e42d---20335420593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=8+ball+pool+hack+apk+androidPDF 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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 10556 bytes
SHA-256: 2de5c7ecca792c40af3e1b1f5c5fb090e0b52aadce58ed77391c8707bd090882
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 17472 bytes
SHA-256: dab3b0fc31fc15320c66d5b52943c120d93756bfa5bca582e0b0458369a8d9c1

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