Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d8946e12b1fa66…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 23:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38c4ce7ab330dd6368658f8a9122f896 SHA-1: 87f6017217e3407807b1dc07b5c5830b0664ffb9 SHA-256: a3d8946e12b1fa66d498da130244468113df08cf3ec9c261bead4e169b50b6a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://onthebroadway.com/CPD/adminpanel/upload/file/govixifinafumetegojemowu.pdf In PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/kufalaxazixaxazaxepitokif.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db40caec88---juledefiv.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/20126797236.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150098f4a7f7---mefofatomis.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/vaputu.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/2728300842.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/91035750106.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/32624719067.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/48617994002.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/66660070360.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/3572759742.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/10691369868.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/5886154308.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/10081344894.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a63b7nqc0fsacv67qihbs6mr53/wevikalinugewepenona.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/womixotexogemugifurod.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/32666713453.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915170053.pdfIn PDF document text
    • http://reopen911.info/media/file/49913860263.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zukeju.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615362c05e6ee---30855914505.pdfIn PDF document text
    • https://citronel.com/userfiles/files/80324312413.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613123506bcd9---16381691613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=xdcc+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_off0000b226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 14420 bytes
SHA-256: 47dfe6fc6482fc0088b87453329307cc33258135b5dd55ed31a1bbebc3a1a7fd
font_01_sfnt_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10032 bytes
SHA-256: 1767fcd2bc5a848d5e5a4ab2d2ac2d7b7668f911a72bf09de11c49c14ba84082
font_02_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1