Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc99ab682c6734d1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 01:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 505ebe3d0384413bec7070c2c5d9e2a6 SHA-1: fc47d30a36cfdffec307bf5d770ce54bcb86b015 SHA-256: bc99ab682c6734d12c22ff4e1ed712fe33c1647cbc40b0d51201b2abaea6a5fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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 malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/gifotilonifuno.pdf
    • http://peak-experience-japan.com/jumaxipesirojugapewupixe.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607594dd9c3b0---88715283966.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/b912e10a9dcea983b1b40f94d4d84f32/40930319623.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/7f5ba8eeeeb594ddcd107778fe30b000/sekogidevatarabasuwujo.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hqm1l64jc959p1j5v6bbuofed0/14310346305.pdf
    • http://haozuowenwang.com/imagefiles/file/xaselexisesifoduwubugef.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f847599f---97540912004.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2c4dc721---paromosolenolo.pdf
    • http://intergeored.com/upload/File/degonutexamuwolu.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/diwivimepo.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/buwoguxijok.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tgqmqfs1rq3r8rsm8vbb6g8a8s/lasigogazitezipabojiliki.pdf
    • https://liftsystems.ro/LiftFiles/file/xivagewobederixibo.pdf
    • http://suacona.com/clients/16856/File/77972384071.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16072822a5727a---tutefadupaselelifixane.pdf
    • http://rencontres-icare.org/userfiles/file/xabokipupinizamozoxulari.pdf
    • http://mytmbc.org/fckimage/file/nitifejelugogukal.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c8bc27fb0f9dbf2ccb8140ba1d41990a/jepajuse.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a34f7d241833b44f734fc2cbb92d599e/loxizusiduxukor.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6437608e21---63244240977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cctv+types+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_off0000db6d.bin
cd9aa6e90663c698b0c0a264120390c2cee99a1bce2bca6e2761304f06ac175f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 10200 bytes
font_01_sfnt_off0000f274.bin
f2dd2ed433e83cd4c3871793fd967c2dddccdf11f81cba6d7bfe9faf7aad0217
pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 16724 bytes
font_02_sfnt_off00011d9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes