Malicious PDF — malware analysis report

Static analysis result for SHA-256 0487622dad0444a9…

MALICIOUS

PDF

95.6 KB Created: 2021-07-20 11:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9dd38376b3828f7a421277e6b32c167 SHA-1: 1b03dec89d5cde912d974df6193d87b1a1b6ae45 SHA-256: 0487622dad0444a98f6a1b978ce58126dfb95c87783e5cd683b55a1aefba4b69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to redirect users to potentially malicious content, such as phishing pages or malware downloaders. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://botosani.ro/img/uploads/file/67180747656.pdf In PDF document text
    • https://bandotrading.it/uploads/file/85140288185.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/22005916289.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e8b80046313d19c45e665c1707a2495/xozebakiboxilovoxunejon.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/17t4tp88vofk7pailmggq1h71i/643501324.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99ed75e49---vonetupasudowomunez.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/pagotoresebiseritu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36e1bafb---69906544718.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///9357775397.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/gamejubepuvurud.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/87d292ab3599340774e21211d321ff84/24899287359.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/907316b5e077e80690b417b42d9c479b/mopudawomuratatifapo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kb9o1fou61ks8trgqmlln358em/30614946823.pdfIn PDF document text
    • http://timebymtm.com/upload/files/tijebagujaruxovu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a3477520e---xiduzuzazid.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/raxoxivenigaparemumugaveg.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ih16r9mspmfu0g3d39kitpbk91/59321157741.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d9d72a1ce5f0493c72f9b811065272c9/lazufobaz.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c1u561u9obr1uc44200tsb6s4r/34211270853.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/zilugal.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/16088745625.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/3e8c97e2ecdaba359a8b5b424448c2bc/pipaw.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vimebenirewazemiwo.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/giseriropalikobatubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+end+of+poverty+jeffrey+sachs+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_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 17088 bytes
SHA-256: b364be8d5fe6ae9959223af449a2c23399534b1ab551bf8ff02d1eea475dbb0c
font_01_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001580e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580E 10852 bytes
SHA-256: 1cd0bf568a2d83e61ce0a79492d85c5a22769299304039a7ea19106737a05175

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