Malicious PDF — malware analysis report

Static analysis result for SHA-256 073464da0e02acd1…

MALICIOUS

PDF

92.2 KB Created: 2021-09-15 19:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0719d9af1ca8cc572a43b634f3259a95 SHA-1: e4f541ab06f716bfcef48f48786bffa919990e18 SHA-256: 073464da0e02acd1b4ebd4eeae6c5d70d2914abf9f9d2ea6c57e9209db37f489
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files, a common tactic for link farms and SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's part of a larger malicious infrastructure.

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://tannhatviet.vn/upload/files/19611921257.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090603105373499.pdfIn PDF document text
    • http://shahgrp.com/uploads/57414862786.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/divijew.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/lixepumetikareg.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5f9ee0f01861f9ffb9a96f49da7540fe/momisidatadexawove.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/reduvizabibavadigefifagas.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/70454456428.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/3467164222.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007ceaa708---ganolorufe.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/bokikemij.pdfIn PDF document text
    • https://sapporopools.com/contents/files/lukevafifabuxavobugonew.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141832e88c2a---22500066932.pdfIn PDF document text
    • http://pololanna.com/user_img/files/32213877758.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/rukavuna.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/59000069244.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7479a4bc---99458592297.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/paviwiwetamo.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/1690756584.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/37944570435.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dugubo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fce38cf7c5---gulemadunefasofipirise.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xatasoxetudawetazerip.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/63956028678.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/rivaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+download+aplikasi+blackberry+messenger+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_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 19056 bytes
SHA-256: 0d3a8dd7af29946fb24144f78ac7fcdf4efecfbdc790868e9eef8cec8eaba79d
font_01_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 11272 bytes
SHA-256: ca214165135330f6bfe025f032fee1a6c9a9bb82f2633be16ed3622366958f96
font_02_sfnt_off00014a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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