Malicious PDF — malware analysis report

Static analysis result for SHA-256 e716f456621cb07e…

MALICIOUS

PDF

86.8 KB Created: 2021-08-17 08:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb5f0937046eb9452f060eae7213b70c SHA-1: 245802dc6a295a3ed9f7585bde7f043c0269d70c SHA-256: e716f456621cb07e0e4d4858658aef60ac4040ca6adb58ffd6c6dd97d8ddf5b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The presence of embedded JavaScript points to its use in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=do+fortnite+skin+generators+work PDF link annotation
    • http://air-con.ru/upload/files/41295139396.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/2543199134.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210727_8177A88AF3E9A764.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd10b9759a---71060888597.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/15871681492.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a91db1cbf40---pujelisefebutaxojunirovo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1451793d1addde37bc4a5b4e5565af76/20153667453.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d2984e16---lidetulubibumobadirin.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/banenepozelod.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ce5a91d9---38205006509.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c1fc982c4---kukokebodij.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/81897394812.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/95eqke4r2fansfbnj4qt3qtapd/33942129859.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080299e708e8---zuduponebiv.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd0ae580f---zeruxo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609f83f3f3f08---vuvaxasi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wapubebaxej.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nenopivafasenimazilir.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/92349372433.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16087349fda160---kademinidekut.pdfIn PDF document text
    • http://eghamatkade.com/basefile/eghamatkadecom/files/vemetot.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/38721209178.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/goteq2na4mrgqlea4778d6ck4n/wefawugu.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/rujikumafovopixutiloz.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/18382959404.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 17728 bytes
SHA-256: 3494a56b1d7513b09360738daa0ea56caa04d4fbc78a5e38ead3f1ffe589e83b
font_01_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off000134e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 10520 bytes
SHA-256: 2a84f413c3bcb4e8a9937ab6a88981f5ebb94549d5cfbf4e36b92145cb856e76

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