Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfe243feff33d8c…

MALICIOUS

PDF

86.9 KB Created: 2021-08-09 16:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2031faf7ab4d7a6495d16ac0b0b43a4 SHA-1: 1068a81e1d985a6c3f6d2b4d547b847e2f5f0a15 SHA-256: 1cfe243feff33d8c765ebe5c688097dc409bc79df7a0342b328ecc6e67d4f79d
176 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs, some pointing to raw IP addresses and others to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users. The presence of embedded JavaScript, though not fully detailed, further supports its role as a malicious document, likely for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bjjewels.net/nbloom/fckuploads/file/24754318942.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/dj8k25krj3tlp5l9gc65umueb5/kogevijitevimaselajupu.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2aabf0fc---padavevav.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9e56f1eb01ef976e79c025b43a554cf2/lesudafotebukopevigakonem.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc6233fdb---murefujativabiwuwev.pdf
    • http://kidsjeodo.com/images/files/tonose.pdf
    • https://sgotomotiv.org/upload/files/37479723773.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3ab56ebc---katinudib.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272b09e90e---loxutalakepezitunavikul.pdf
    • https://heritagecambodiatravel.com/userfiles/file/zabibu.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608897a79aeb8---rikedu.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ecdbbde3---janap.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/lilop.pdf
    • http://agendatourvietnam.com/hinhanh/file/sapofetesogeka.pdf
    • http://onishi-kyosendo.jp/archive/gidudazabinixuliruj.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/45a7b8e31cfc6dba2e87d7cb8da2736c/15184632196.pdf
    • http://ilovechardonnayhills.com/userimages/38000690107.pdf
    • https://tarzminder.com/resimler/files/19175403266.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/bopumebeniforekaxuruni.pdf
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/95500449839.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/32718b61a314086edc934966aadc2018/36054749840.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f49e605f9---firefekowegesixoxal.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc39caf15---rifoluxejikeki.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/95537671754.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ford+mondeo+mk4+wiring+diagram+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_off0000eebc.bin
55fc40127a2bdbea434ba59856936d4c786d74caea737b6a488aff700b9e42d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 10760 bytes
font_01_sfnt_off0001074c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 16792 bytes
font_02_sfnt_off00011f5e.bin
25d11900a777eab0bb546da18d6ec1f6f4adab464e0a2d5cfd8299fac73b49bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 17528 bytes