Malicious PDF — malware analysis report

Static analysis result for SHA-256 73544a84d6232171…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 13:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be236d8d8230ca06f81db8662271b371 SHA-1: c6a3cff460af90416408ff8d58e85c147539913c SHA-256: 73544a84d6232171044b689e63076a9af78665604e367f3fe8a5600de5d66cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or host further malicious content. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://zuche0551.com/upload/file/97939625048.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed62cd89e5---tupekolelefimikojeluxe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/rejofurovowupugujo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501050536986496.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vajal.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zulosetokaruborumewoti.pdfIn PDF document text
    • https://salwangurugram.com/files/3515391130.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/abad3b019cf816de9387f1c7afe2c33c/ketol.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/41502475737.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/kazokezef.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/62315458878.pdfIn PDF document text
    • http://klhl.com/userfiles/file/gawujigewumoxuzederidemuj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ahg3p28e8aq859os8p058ius60/66624773985.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/67030550471.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cd8cfb8b1b5448a4435d797be4fdb469/zadobaboga.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104ccb7425dc---33799581494.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/jasib.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/jikavutonudusuvajeda.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/36279432169.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nr063tgiqbk69ouv719c9ebsnc/rerugixedujume.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094674fa75da---bilewazevetufadedoji.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f8395553e872cbda1d7ec38d2ab729ff/98875977326.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a10f59d9b---68200073739.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/78650384958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=thermal+power+plant+boiler+working+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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 17088 bytes
SHA-256: 91357d796368ef68430c7cf964f6a7bfc847ea4c085b5b7548fa787d99827b56
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 11060 bytes
SHA-256: 9ff3890f31875d706d6438675d7a904b096d11b99f5c8ce5112eade0ed1dc5f7

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