Malicious PDF — malware analysis report

Static analysis result for SHA-256 477e973fdc1e9ac6…

MALICIOUS

PDF

110.5 KB Created: 2021-08-11 18:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c053da0d1a46106105aa0af8668f21e9 SHA-1: 882bf8416e6f81ac2c64254bff261686423d36fc SHA-256: 477e973fdc1e9ac6cc2c10fe120a354dd268bd2ae0266108b053f233f5ee2b57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external resources, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160be946f209f5---66283774011.pdf In PDF document text
    • http://cuuhoatudong.com/upload/files/36751881298.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/ribinofugetud.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/1850462795.pdfIn PDF document text
    • https://schmitz.cz/res/file/vimoso.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35ddce1c7---fuxosalibos.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39b007f64---jalafom.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/nelovul.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/20514341432.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/25243962862.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/resenagobakirak.pdfIn PDF document text
    • http://altinay-law.com/images/file/44038920344.pdfIn PDF document text
    • https://profesa.net/userFilesfile/zofib.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bc07c482a6037f6d6359dbc307359700/popexujuwo.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57121176828.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/95385801618.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/18166950959.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/lexezet.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lexinipibajenafuf.pdfIn PDF document text
    • http://mfahk.com/upload/files/xuninax.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d6725e47d---zoloxipep.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c01d852c57ba279e29984f647dde5496/84562149591.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/sojeterowiwedipoguwa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bce5750eacd---dutusumowexosozariwevuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=red+alert+2+free+download+for+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_off00014c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8B 10428 bytes
SHA-256: 862d1f2ec500987415410c4fbc668f2234cd5b0b1c49caf228d7aec15d1fc51c
font_01_sfnt_off00016462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16462 17888 bytes
SHA-256: fd0c2803f9c5e5ebf50ebfe509693cb58a14c9452d3a3ba62347ec36675253c9
font_02_sfnt_off000192c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1