Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6ace9edf6d6135…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 00:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2e4ee34d03e87381f67296fe97395d5 SHA-1: 11c4b312c8dbf56a93d0daf8b179cd1749380e78 SHA-256: fd6ace9edf6d6135a226314d9351cf1a357799c235b4c7031aafcfbdff604583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://efnnma.org/files/file/tebudimewikemov.pdf In PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607056cb00daf---82699195423.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/vexerukopitugal.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd316cb941---vunesufuzazutabavekawuf.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16099bff9e3d70---79227668317.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/kelalumuwenudafopefabowef.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/penifebolo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160821a088bc0e---jariwonelexuxanabejufabi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/79055119779.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/1k4tsm0hfqqptbsn59j0v7mr0i/vemadonelejilen.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/45329078059.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/juzuzefaxajisiz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4b9ed4227---63551717364.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbed4e6ddaa---9017077661.pdfIn PDF document text
    • http://aven.su/userfiles/file/pasaniz.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xubox.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9e099a53---2007294046.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/73836903125.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/52931706952.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1625720582.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/66601619685.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/33c9c416386d5b4684f284870b08bf65/texilejexufazopofagodu.pdfIn PDF document text
    • http://qwerty.pl/_data/file/disetubat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chevrolet+optra+2009+manualPDF 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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 18176 bytes
SHA-256: 84559a1c896cbbfba6e9599cb2081adb8192f10c44c4bd160ea377e666c21666
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10864 bytes
SHA-256: b0227a933f9299c8454b806dfdabc67d7f3426e133db98a6f74a2a008bb17cf9
font_02_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1