Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8e73473504dfb4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 09:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f25cc334f42b8eab86a953e017488498 SHA-1: d6a93e74531ffd01554f7d4b16b6cc0ff497e561 SHA-256: 7c8e73473504dfb4a42113ddb56c5e5c9398e124e0e4b5ae58ea0b3acfcb1d73
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://agape4u.org/userfiles/file/zumozagikazokijebi.pdf In PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/mozopiguziji.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/nixafitumowuxi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rdlkgnndccnime9evfl7dtfof6/67372915111.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/voforujazilatedexotosuwif.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/lubuxunukano.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pebanuzitolaz.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/vufexuxuxa.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dowaxa.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/58739743942.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/48523768026.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614169f6a8d11---15696267724.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f09e1062b---66390616785.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bd5c926f1e09bbe6ff5dc5fce06a00d7/wimakizibil.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/16998851152.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/39626821163.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210913_85C39986DFCDC040.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210903023159_NTY4NTcwNzE2MzE=.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f02bd0c7bd6b3eae88722ac10154782/jowoxarixademugi.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/43781260553.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/36748231010.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/xunetekifefubivonok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138487b967f7---demejuxoxeluvegugakap.pdfIn PDF document text
    • https://patc.fr/imagesfile/41006935689.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4a37bac5b4f0432520759163bd10b469/11136967775.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/26586990116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+utility+appsPDF 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_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 17636 bytes
SHA-256: 906c31e219efb5b9a63b0785f886d1816b588cda7e7a3c2be1c2e4f106d579a9
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 10448 bytes
SHA-256: 0594ccb769c697cabe615f12de4ee6ce440e5d29ed606037ea8df83ab03a6425