Malicious PDF — malware analysis report

Static analysis result for SHA-256 da62173a121aa7dc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 18:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac935e124760a10fbadf1e8b6c2d0319 SHA-1: af45bdec0a074c3d2e5cd020145b4f39b94735ae SHA-256: da62173a121aa7dc4c1dbf61a28050822d5bf164bf46468dd33f253b010d4518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://copperscraphandlers.com/ckfinder/userfiles/files/narewomusu.pdf In PDF document text
    • https://penzion-palice.cz/content/24344867072.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/3194503803.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/7460644643.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd13a3dca9---vewoxibabekum.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/lamufipovopujow.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/65517652847.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/lulonesizekiwadux.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/74920015483.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b4c5b5f5---depekaluwo.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/sabigezonekoluwagixovokax.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42869348011.pdfIn PDF document text
    • http://keacg.com/upload/files/25071492451.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/87212644190.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/87922445636.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/xezonerepomajapamo.pdfIn PDF document text
    • https://network-italia.it/file/rafuvoneboki.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af870b649a---9211548658.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/zinofefepenom.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/xavevewati.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/kimomozujuwewuteferona.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zamutoma.pdfIn PDF document text
    • https://ever-progress.com/upload/files/62758862650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hd+wallpapers+for+tabletsPDF 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_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 17652 bytes
SHA-256: f745dfd481b4a36dd681ac56a77cc1c02db6110d4b3c84f6e63e21a7ddbd9f77
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 10512 bytes
SHA-256: 21c49b8c0c206b68889bdd7dca7e2c4adaf6e25d073c39690a3e0ad07b80d2e6