Malicious PDF — malware analysis report

Static analysis result for SHA-256 9735bcae616d0c9c…

MALICIOUS

PDF

140.1 KB Created: 2021-06-28 00:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e831db8bbae5091be8a0fc01c19deb66 SHA-1: 19882759b39a27f13cf9ce52f4712ebf550d2b34 SHA-256: 9735bcae616d0c9c558fc0ea0554595736644fd64cdd1a4c10bdfbe097d7dcd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a lure to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://pistant.ru/uplcv?utm_term=h2o2+covalent+or+ionic PDF link annotation
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0227971a---katiximovutu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hnei95nqrh325kjdao5h7t0gus/41786836968.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c7abc8039---dugizuxenebozuviguxarug.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/mojipokadulawajewimowoj.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/katimubin.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb4524663---visevonikebinexa.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/74665541485.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778f6494b2---dapikanivanegaboxazigew.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/16325848601.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/85830656473.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/depuruxetirived.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399fc09bd1---zefebajogesimefufagizilax.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f296d868e8bcb8b9c6a4c175adb0817/82219335887.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a064a6a39a7---dopareleruradalesejanipez.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de5df7d5c2---1503876478.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/48b18c42063ad2dd56c8ca56380acbc6/sefuv.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda22d942a---basexeruzopililenupub.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/dexudaminotuse.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/49659c386bc7d7e6970f6be0aa381fd1/58619722525.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jafirosi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/josuzagujetexitag.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/juzulorenezebeboxul.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f05c2d56---92396487394.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/deviduguzeju.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609687f7f3b7e---xuvojusotimuwezapika.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e085255aa8597303ba900a37e41e7d49/35457857275.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4D7 21360 bytes
SHA-256: d47714002a156cc9a411606fdd5ac049aee019ab26ff3e8f92ef7c030d133964
font_02_sfnt_off00020ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BA8 10232 bytes
SHA-256: 3e32cf9ffa297dbddd9e499ce282a4fac4a154bbeb89b7b97458e856bc7b9373

Open this report in the interactive analyzer, or submit your own file for analysis.