Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f648c888067302…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 21:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 518dcc43285274df625c1b42de9afaef SHA-1: 11043530dbe3a6e8004ec91ca9929f1e41016a74 SHA-256: e4f648c888067302349ddae1f8df19894cde70d53aca54acb75aebfa83345bcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and 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. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://thaoduocquyhiem.com/userfiles/image/file/zepokadatezipepubagojex.pdf
    • http://jnnycc.org/userfiles/file/89873444647.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654c6c8405---suleziwabiwikeguxolarojeg.pdf
    • https://immobiliaresancarlotrieste.it/file/taxezepupinuwefimamuw.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/lupemagemofatonex.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kl16uspmsio532vj1mrfrqce0m/jofofiravebofonaw.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b8eaaf6991448ab9b1b15cb8f0c2dfc4/tekifeziwajeve.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d99f918ea---benuje.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bec84dc96665a86de38814e6dc26cb2d/vapevipizetifesudoniwa.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc46ab9d19---59960974153.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kupabexutuzifexukizi.pdf
    • http://iuf.kr/pds_down/files/30977655118.pdf
    • http://bobiniauto.com/userfiles/file/bexobewizulud.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14348f1a0---87364504656.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/74216864804.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/550ddd65e81691b5d87d730b1ada90db/zukanimovaluvob.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10464373651.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/74847530048.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767db6d0079---zefagupaji.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088fae8630fa---mikobixasiraxugeto.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7c32e87c2---90278270823.pdf
    • https://autoparkalbanese.it/file/lezukajefipu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56f06ce92---fanomewuramokifafawumozu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bc9c25ca4---70065422054.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6e1d3dde---widetevorarifulokekiruvi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=postpartum+abdominal+pain+right+side
    • 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_off0000eea9.bin
29f4e7f5e1190a15fce46a74fbd998d83b866d9d54abbc4e54f602b35e08e17e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17468 bytes
font_01_sfnt_off00011c55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
font_02_sfnt_off0001346c.bin
4c06f82eed1cfa32b156a9b11e2125580f360173629a99ea874c4a64bda642ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 11080 bytes