Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2875d1c0e9e3a4…

MALICIOUS

PDF

98.0 KB Created: 2021-09-20 16:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03e3ca68aad85f318277499a777bd1fb SHA-1: 5eb978543281a9159b60844512b6ac5885691ded SHA-256: db2875d1c0e9e3a4ab9ce4baa017fca82d66aa206c8ed733f18a553995258308
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting an attempt to host or redirect to malicious content. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142dc2a0f9b3---70007066154.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a5fedfdac7901c44167a6dd39a123ee7/15391421137.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/73564880023.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/49693997503.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/79269644049.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vimivolasanurutiba.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/zepemuxadusewetagibif.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/68319423174.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/75203933732.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210910_4BDB1962CE2A76CB.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/27391934608.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/lokudofobo.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/1261935651.pdfIn PDF document text
    • https://mmszke.hu/files/file/53492507760.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/wilojenaze.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/posuvebeminer.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/gevoreju.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/79920594309.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/newobininamemupide.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/pofisegetipivazoxutisa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613486ca53451---67679906385.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/92315592449.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/88870899132.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/89719200412.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903145207392620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+mi+ringtone+note+5PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10644 bytes
SHA-256: bb5d19903f198c6961b5c48176c40a9fe7391da2414263c55336f247731f57f1
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 26792 bytes
SHA-256: a6e7c43e3313ed7fef6572ee61c208771741f8ee50ba5c0cd32b6ff128641134
font_03_sfnt_off000157b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B3 2340 bytes
SHA-256: cd1bb0a7a77986e136286b0532e456579c0c568bb706f088dfc8947233105a9c
font_04_sfnt_off000161fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FB 16528 bytes
SHA-256: 906d95d8a9d42191ff20d372b3c84d575e9c4cf21cc3980f8075603b5e340bfb

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