Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1401bdcfe39eda…

MALICIOUS

PDF

75.7 KB Created: 2021-07-23 17:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 779fac3c6f902628c17d3d2af1799a79 SHA-1: 80c988cfd4c08b802479e2c3768375c1e9d1054c SHA-256: 1d1401bdcfe39edac738cb75cf4935e350a85b0f07d8e59a134b679c81ae95f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d237539d541---97911274345.pdf
    • http://immopolignano.lu/images/maxofezivowekoxiduligosa.pdf
    • http://longvu.vn/Images_upload/files/memom.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bab364c19---nikowekaguroza.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edae8ef946---pomepudowu.pdf
    • http://mariopresto.pl/userfiles/file/77883012282.pdf
    • http://eprdel.cz/userfiles/file/gisodumobov.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/k03h4dii9eu29dgmpncpvvfar4/80808718832.pdf
    • http://www.frank-diagn.hu/userfiles/files/waxim.pdf
    • http://phelieuviethung.vn/upload/files/jugemiwilopevizijatil.pdf
    • https://digireg.nz/upload/supaganowuwelusunigigusox.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c1d2d9ca---kuvomuwapig.pdf
    • http://beijingxinzhi.com/userfiles/file/20210515072437_323876757.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c46fb64da---4308106980.pdf
    • https://metricgroup.it/uploads/file/zilejexupikefijivarusel.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06ab398a7---bumug.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160777dcb7ac98---zapinelewupofuvipadirapo.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ff2029232f30d9e7a63e7de0eae92b32/23799879493.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3aa7c41f---62943887398.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607239d3ad24d---5917288567.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/nuwegadaxazadon.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7463ce681a---dupubodukojanomavowowaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sanskrit+grammar+pdf+for+class+7
    • 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_off0000c4f3.bin
ef038f151c3971b0077efd4fa3088071bdb343929ac024221a4811e9f9362ba1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 16812 bytes
font_01_sfnt_off0000f01b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 16792 bytes
font_02_sfnt_off00010832.bin
f1f5e2690d56cd4ba6905a20cfcab4c6aa546926706a734c7e2f2fa940a97da6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 11048 bytes