Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d92bdb7dee67ee…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 03:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b208d432f347fbab497e39370c6d150 SHA-1: d7851023ba8c6811d4081fb8b8df7cebb4d44cf2 SHA-256: 09d92bdb7dee67ee66572c156a586fccdfa988fc123a1373b8bdfba85dea4630
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or 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. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards an attack pattern involving user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=match+question+answer
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cb02a090---91164977523.pdf
    • https://wineart.online/userfiles/file/75198599428.pdf
    • http://djapm.com/userfiles/file/79963452906.pdf
    • http://drivescuolaguida.it/userfiles/files/genilutasipetixefudo.pdf
    • http://sabancilojistik.com/userfiles/file/10249175417.pdf
    • http://abpaluso.com/upload/file/ferudurovimenug.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0c12a2c0---84744757759.pdf
    • http://sport-way.ru/img/file/37087869989.pdf
    • http://www.yt333.com/userfiles/20210728/file/1627458935.pdf
    • https://avgdesign.com/userfiles/file/jivefujonudoxafo.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggmoh5lda0nr6hv15ag5d4o2n7/bolunetuwuderig.pdf
    • https://noventa.cz/media/files/file/juzekoz.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf999f0f53---16364015732.pdf
    • http://centronegozi.com/public/54406961082.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609887ceb724b---nemixeta.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhd7q55lkqovid728cs0r7g0g2/bafififofo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/agvdb68anojrfqidal05dei4u7/kudebitozelekujob.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/86543444027.pdf
    • http://agroanaliz.by/upload/editor/files/48351498664.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340c030a7f---38877361177.pdf
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/61828297664.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/3137045567.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5gh1frjanrboostjr9cod0okdf/gapekepizeza.pdf
    • http://alibabashipping.com/userfiles/file/rigewelixigasutupisolo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mb2eci59fe9hjt8b29b3af6dpu/bokalotipemepuwe.pdf
    • 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_off0000f2eb.bin
65d2cae55d6ee6bd7bb79a0bb86ba2d77e3d395f2caa261393f35b5dc427c9b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 17872 bytes
font_01_sfnt_off0001219f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 16792 bytes
font_02_sfnt_off000139b6.bin
4f5a05c71d32bf9a1131994dad3f881f59155b686e625c722c8de405ca91f6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 10608 bytes