Malicious PDF — malware analysis report

Static analysis result for SHA-256 35574cb7f9621765…

MALICIOUS

PDF

88.6 KB Created: 2021-06-27 07:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d50bc952d2ab4950ff0c6d9c5dd92b67 SHA-1: 663cf8c2e4fe5bd67f2eb60dfc2684d71bce4ebf SHA-256: 35574cb7f9621765206e613c66e9ce4911c98827323d79405efb461aace73d4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lr87ln0pfcjr8709c17oaq46o5/rasebofowafizepufobe.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/eejdc32lguo6cut1f490dbbais/45010037863.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757c9eeea7e---supudexufatujinisur.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/zikadituporub.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/5813972419.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cab69040e6fe060fcf5532a4aba34e21/36817423067.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3b9dbfdb13d0e8ff13dcd82b7bdd4b2e/seguteguwodefutir.pdf
    • http://stark-tools.ru/images/uploaded/kowemubuwe.pdf
    • http://robertoantoniz.com/resources/original/file/84900008851.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b472c578---lowirigeram.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5bb31c0a---surigebobogu.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c127cd601f9---80649163100.pdf
    • https://unicon-msk.ru/data/files/zexez.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608864ef20577---fewumoz.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d7fb0305de9---bikupisu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ls1224aogr84jis47hms10had4/jowudilesitewoguko.pdf
    • http://haohanlegend.com/Uploadfiles/files/77253283206.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e6140d56---81096328433.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160819b3edcdc4---53543486480.pdf
    • https://agrimal.pl/userfiles/file/85318812645.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f80d302a---47001635016.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609252c4d8db9---sajevozitogekudizibe.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608457258c832---29658043607.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/zafogafipakubuzuv.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb401bf7f6---rasaw.pdf
    • https://eberli-medical-supply.ch/upload/file/fujuxisaravakap.pdf
    • http://alphasigmaoverseas.com/userfiles/file/33297288956.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=preschool+words+that+start+with+h
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin
617cddc99c5a597429dfece70854b453ef75ac1872c05d956f893abc37743c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10448 bytes
font_01_sfnt_off00011142.bin
7cd4100958d0db2c844a449a529f63420d568ba2fba808228ab4746b364cce26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 16840 bytes
font_02_sfnt_off00013cea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 16792 bytes

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