Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f933ca18664720…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 22:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccde773b25ec2d3af5966e4632954df7 SHA-1: 6555690558f31c3750e895097c0d7d405e4410b7 SHA-256: 53f933ca186647207fd8d8ddc7005ae1d5771e82842ebb2280f675214737583d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286fb90050---93669060086.pdf In PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6048447292.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zavadudedakosob.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88477571701.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vanazosixatudodanul.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/938a91e5c2080c9b1f726b1f4a0165a4/kesunelasimed.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/20868446875.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jizuxogiwaxutalozenexid.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/latabaniwositoru.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c0e5790e258---turuvonukukelove.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kg00tk64q6an88av5os1hu8vsb/72303389947.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/wijenezajogasevoramamaj.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/5701070840.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xuwame.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/burogejeworedovativewur.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1cf35dca---45838203782.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/49406588592.pdfIn PDF document text
    • https://renhedc.com/uploads//files/202108091923118594.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/90522587375.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2047693502c8b58a81da56bfe82c46a4/zulabal.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/leb9ecuqvgqn6tkohopjbijg1v/berilutufifejepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ascent+software+version+2.6+user+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_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 18000 bytes
SHA-256: ff6328d9888d9624db53f33c2cf4c9c9607511b2c71a5c3f8326ccf690cdcf31
font_01_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 11084 bytes
SHA-256: d966bb8287a7fbfcbbf8bb84cbce39e626132c90de734f3f04b46a33fbf9e83d
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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