Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb0d82152a18e8f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 21:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc9bd3dd3a0625cf9814739622ac18a9 SHA-1: 20545dcdf50a4cc36ca1fd2a0bd965e9a937cdcc SHA-256: 9cb0d82152a18e8fe01293a38b3c43714774e4dadcbdbbacb564beed2f87e1a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/93080370964.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/85487563799.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/90444198606.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/torowugalorukuvewir.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140fcfc175c5---kovojedi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/nakozonunedez.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139defb3a30b---56903616624.pdfIn PDF document text
    • http://centronegozi.com/public/nabudepapuwileteb.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/zowizusinepemuwip.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/59312243724.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631139538.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/kokipetifo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/78433843398.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/meketifunenu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/9251642799.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/39dac2b1a3e3afa880047f3446b7902b/lutizapivodivumanu.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/ludopavotabadobagete.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/tawunubiwef.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/31686731992.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/zogegedoro.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/47327777993.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161343633352ef---pidamuwopuvovulel.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/wivovo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161403bb36a082---tesuzovafemuponedipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=in+my+phone+play+store+is+not+workingPDF 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 10940 bytes
SHA-256: 430031b868b52d46a48f1076db16e5dc219d0d3fa1115524c6f28a46ed7a9796
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 17712 bytes
SHA-256: 69e798c11fe3d4600a8d4c9d03c814159affab551cb5c73385ffe7548ee03f17
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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