Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fadf22d7532b863…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 19:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5802ab0d12087f28fbdc8f79f3d610da SHA-1: 3db2d7e5d828b3a2bd6903450f8c6e3d99c580c2 SHA-256: 0fadf22d7532b863e7bede1f42d995b825ee17ce551ffa46393602894d49d935
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be a link farm designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac84b3a88---kejafoxajimoso.pdf
    • http://allprintusa.com/admin/images/file/13245068432.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48258447527.pdf
    • http://giadinhlaurenso.org/upload/files/32578735762.pdf
    • http://www.focitabor.hu/userfiles/file/97053144813.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/16420194757.pdf
    • http://findacommodity.com/upload/file/30181296243.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae26d96532---gulunuk.pdf
    • http://studioriboldi.eu/userfiles/files/gutujusajoxa.pdf
    • https://www.fangjin.org/ckfinder/userfiles/files/6952474684.pdf
    • http://toyotacri.com/userfiles/files/25304014589.pdf
    • http://telekommarketing.com/firme_data/files/bigulim.pdf
    • https://yocarbroker.com/upload/ckfinder/files/fudijefavulebovupomox.pdf
    • http://marsalanoleggio.it/userfiles/files/31491021618.pdf
    • http://mexxeopaint.com/upload/files/36542510117.pdf
    • https://latgalesamatnieki.lv/files/file/nidiwifuvofakajof.pdf
    • http://saraswatishikshamandir.com/singhania/downloads/file/tupuxewavitidududifu.pdf
    • https://mediaget.ru/userfiles/files/tolofowikedi.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/viboranogokeponamikaso.pdf
    • http://datacomsystems.cz/userfiles/file/92406394602.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401c9e6fbcb---88379455251.pdf
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/buxozekimil.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e8ee31c1---99828153782.pdf
    • http://etepi.pt/js/ckfinder/userfiles/files/zofezezuvitejusiwopisal.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/30006217967.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+trading+card+game+gba+rom
    • 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_off0000b282.bin
26b8392c5727bf425412e1d2993fc89608618dcf7263e0706f007d6c7566adfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 15852 bytes
font_01_sfnt_off0000dae5.bin
712cd01cb6fbbbfe37c3dd0af6239c30d66beecac73340c1d7876a83f3c0ae0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10732 bytes
font_02_sfnt_off0000f359.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes