Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b338e26ee332af…

MALICIOUS

PDF

78.3 KB Created: 2021-08-14 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d251ccdcf78c13bf331df02aa436f441 SHA-1: 9e5fb9953735b6d1b60167af86dfd7a9ee5db325 SHA-256: 32b338e26ee332afba0583f005f54a5fd253a425281c68e4feb716c9a75c4506
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS platforms or disposable domains, designed to appear as download links. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://razredna-nastava.net/files/26475567036.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/tinuwelitajekavu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51aed9540---17675138294.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/36532920868.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kakowowotutujinam.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/33344059474.pdfIn PDF document text
    • http://guowangcable.com/d/files/vaduremudib.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/90994328576.pdfIn PDF document text
    • https://puppometalli.eu/file/26412580938.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/21644084949.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730667651f7---mesanugojafezoxivevawul.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/37676556736.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/vekavamolifovepij.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab16ad4ac3---8840077364.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/xutufelu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108622c4924a---nixabiritedezo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/sujhmt0emp0cpmjrbges0lpv83/suxebef.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7378d2e079b65b910fc211e4335f5469/2401885742.pdfIn PDF document text
    • https://aashianarealty.com/file/viwubowavalovutusagogidij.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/kozupukeguxidug.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ef3be3ca---26168489430.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210718094429942.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/46558879085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wii+homebrew+browser+download+4.3+ePDF 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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 17080 bytes
SHA-256: efc0b7e18cb7e83addd2421b140cbac6a3bb1aacedc922a0d5655bff910a6e75
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10948 bytes
SHA-256: ea8cd622b3fd07e4650c03950383a5075b00a6cc1d4a7e930093824be6bdc81f