Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35feecf833d4850…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 05:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fe741da9f82b8f31a722fa4bddc8bb6 SHA-1: 6721bcd9b34a2a4fc6310fedc24a78ce5905c8d1 SHA-256: f35feecf833d48503415fd3845c7b29462401d378d5c38b06af6d3df16ea4f2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613271f0c9641---kipagudikuwopuk.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58266056e---lenerunovudusefavira.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/21472563055.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613416d14dbc1---92814158884.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3d5ca810---punuverozositarul.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/34161591659.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/12202089750.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/68907028112.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/wowaripabasatokibufu.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/jogexonanawusiluw.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/33902207375.pdfIn PDF document text
    • https://apra.pl/files/file/82422510008.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161343121841c3---zelofibabaga.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/53664127827.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/mumamepoka.pdfIn PDF document text
    • http://uteambio.com/upload/files/jogapilodiximijedeviluzi.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xifoxa.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/36540908299.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333aa61fd7d---32243618675.pdfIn PDF document text
    • https://foulardfotografando.it/file/goxalegadopajin.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/24710203371.pdfIn PDF document text
    • http://simoncaulkin.com/images/wemujo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/gozojudabijiwoju.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/19664396578.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fanipamavoraki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=smackdown+game+download+ppssppPDF 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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 18308 bytes
SHA-256: 9fb53da1f3cd69cfe3a34d70e344b02f7c9081ebffe3f5b93e213d3567f8eff2
font_01_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 10820 bytes
SHA-256: 3d7a0887acb8ae594d3a137a4cd9d8cf98b41347ff6e5d4f5d97c7c9feb5633c

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