Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca7383856640636…

MALICIOUS

PDF

77.1 KB Created: 2021-07-08 15:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa117af5256c68ba27f0f8bfff5154c2 SHA-1: 03b49a89e4a682d5998ddd6f6a8da56e4a02a6df SHA-256: 6ca7383856640636aa191ccfecb06a3407c5b0c5edb05be159d3d2cd728aa51d
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 compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6863

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=scrips+meaning+in+stock+market PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607966578b860---zirivapejikazona.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f7210cb7e07fc773680947ad9d87adef/padomavavopukonaz.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/wadaxozopipuku.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa536e4be7---biximizutasepuban.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/08d6856f4e1178bc910e6d71f65cb63c/31699065756.pdfIn PDF document text
    • https://eslms.com/userfiles/file/woxonivam.pdfIn PDF document text
    • http://chromatographvials.com/d/files/95979068278.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/baxukijufepaxinorutogiviv.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5a5908c20d05bc694dd913d92c49c68b/nigezinumujegipijo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf253f425---12696185680.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mhi21e814q3loumu7de6h8lfe5/43208767201.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d33ad35df8814d52ea02ec2df5da61d7/jeranavuboputovizebawa.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33f590468---webakokubugef.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051823143086.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/kogejijimerogakapumo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddc5e5628---45331470738.pdfIn PDF document text
    • http://abc-tel.ru/data/File/57375969566.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/monazanubobuzuvod.pdfIn PDF document text
    • https://chpcentre.com/files/file/murixew.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/fiwudot.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/22630965415.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/50551259325.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d92a19fac---25163887472.pdfIn 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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 10840 bytes
SHA-256: 5f8117618273c1278cd9c1255b8cb70a2e14086ccbba532ccc1486b41d9b1c5c
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 17312 bytes
SHA-256: 5938616a002856654d411dd0fe6d0053ace80ac8ab29c43c7bbb9dd18fb75de4
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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