Malicious PDF — malware analysis report

Static analysis result for SHA-256 d320c5d8c3a0ece6…

MALICIOUS

PDF

98.3 KB Created: 2021-09-06 00:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7602ab2828b4cb0a23f83ab3b063ca00 SHA-1: 4cebf1fbf45616b1a7cff7274853ddb5b70c754f SHA-256: d320c5d8c3a0ece654686da1b46d9943186733ea1e3bdaa844d5bc12a0b0eb56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://bangvetthuong.com/luutru/files/visujesot.pdf In PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/79545991420.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91df10988---6056827107.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9126crdp7etc0pgid6pej0l862/54187944620.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/93451279545.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/tazezukabuzemeke.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/filapugakefox.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/ribuzedimelezimagowopuxev.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7492204d---tuvutozixuberikoxovus.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390e947e1e---zepivejokuwixutajobeb.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e27fe82693a.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/rugiluwufevul.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/61568411114.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4f7200ae---13180877270.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/seduvanibeliwi.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/tojagajaxaselu.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/giledegewovuwekejowefa.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/bujefu.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/44401630418.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8de1a4690---tosalemikanop.pdfIn PDF document text
    • http://slsnn.ru/content/file/gewuzexosedasa.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/13823921599.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/50563582492.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b623a31f---98619268736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=eagletec+kg010+mechanical+keyboard+manualPDF 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_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 19036 bytes
SHA-256: 4713548288c698c101577eb8bb6be5b13715a4c41f0dafe258f39883d6bf32c2
font_01_sfnt_off00014994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AB 11252 bytes
SHA-256: a55a0f245b463cbe7538c6677c3461023ba064a4524d0bbf0977f0ed29acf776

Open this report in the interactive analyzer, or submit your own file for analysis.