Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a160ace750470ec…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 11:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0493e9e295679ee63f4b21ce9136d8fc SHA-1: 8abf89eccc3baf7097a682af7d58428f1c79d9b5 SHA-256: 6a160ace750470eca13f1864526b5345fa282a923e30e3337e017109e9a7267e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

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://ettorebelfioreliutaio.it/userfiles/files/77662002491.pdf In PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2bc92edb26a7f7bc4c0b6b1388875db1/49386061632.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/punobomoxa.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e183dbc12c1f18956470aa01a831f542/majirijojanaw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kitasamisurusadubof.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/40472379943.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/zewinak.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/widite.pdfIn PDF document text
    • http://deauville.ru/files/file/95835036225.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lutujowoboraro.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d75e0eb95---fomonopukigarokazemejur.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/vizugefumiga.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/34522742099.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/vemowebabakuvutokadezob.pdfIn PDF document text
    • http://woykoff.hu/upload/file/20821172601.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/43698926268.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/dezobalalerefajesozevopi.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/rezeraje.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/vowegi.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906024531.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/denogonuraribuzedegul.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/49418516200.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/kaliduvezugireka.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/tuxoxugusavumi.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/porabavuwukoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=computer+application+examplesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 10768 bytes
SHA-256: 18eb7f2d5756dcc756bba6b6bb90488780c1935fa9c4ce9ff5f61b96a7bfe64f
font_01_sfnt_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 17236 bytes
SHA-256: d3dd9296e0ec6ccaa3a854f25188802dc358cc1e6ede161589944725c8b7376f
font_02_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1