Malicious PDF — malware analysis report

Static analysis result for SHA-256 964fa2b598288676…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 21:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 252082f13de4f2a8e38f448a189e54ed SHA-1: 23a499a3f48e80c41116ed37d26d6f94b85395ae SHA-256: 964fa2b598288676a6b15d7ea8e092a3326ab6573d168fde5db7ebf0c3de3b4c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/03b79856d84991886a6731d85c16218a/32909036677.pdf In PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/fevanovem.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ebdd33dabf7bb91cc0c27ecbbe1ee99f/vufarizeneloz.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/69581684122.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/93355208752.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8isd92earvaaaafjqie8o5c532/25167823964.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/43000474757.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a545b18a3---puregipanujete.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7752e2d944---38102572132.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/bea2a96fc9879ebe0179bab2f73569b8/guxawabopirarisafedijurex.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xanag.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6e052f4beaeeb88a054c277083ab7150/21586058681.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/83788545465.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d3df3e5a---tufujozakurudaramunavagoz.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///70541857170.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zaxidudelatobi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607145a70128e---jetezorabisebi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/66o2suhsb15s3bnph9dpsda6hn/39291021740.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/95927036335.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/55880468530.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/79573426956.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/durini.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/gh62jah6g886dl1n6vh7nae3pb/likeboxiti.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/kifinenexom.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f5b2df41aa042b747ea029d1d83bee4f/16775121155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bpo+interview+questions+for+freshers+pdfPDF 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_off0000c0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D9 15976 bytes
SHA-256: d64acf4f4df5880392b22fdbbd99c551ef96ecc1d260d5fcf7b4e8623568a395
font_01_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10840 bytes
SHA-256: 994608e5c8e909daf1ed64a1fd3ce3ccb24e7e7c223decbad72fab52409614a0