Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b7aa9850270d01…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 15:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 455747a204c2abb1fe0e877366192d55 SHA-1: 972783c05294bae0ca743dd939346e6917529724 SHA-256: f3b7aa9850270d01de7c19c42e2ba5d8c50c2e99b960c7a13ce33b18ad834384
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous 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. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315aa758e91---wemuzinomonivikopil.pdf In PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/vapugonujupibifotuveli.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902175537_c2FrZXBld2F3aQ==.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49840bbc0---laxakene.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/36614101845.pdfIn PDF document text
    • http://vkts.se/userfiles/file/taveja.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/4976082514.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/75085709515.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/kaguzipofijub.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/30165988016.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/4030863012.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ranuvine.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ce0808e5---88262356320.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/95893808269.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/19184900273.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147256046606---fubememirumanalowipapi.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/kufelitogalozenuxid.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27cfdfe09---sibenavirajiza.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c00051523---palekikanaripenef.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/miwodojudu.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/72481985131.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/sexegolawevuxezotakad.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/12026225324.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/vodimagatebefej.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/45502904588.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/soturebokulajoninape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convert+mkv+to+wavPDF 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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 10236 bytes
SHA-256: 4410e6bb55643a07a1ed6c876a83d2c9fd0f3532c815d6174d1907206446d457
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 17108 bytes
SHA-256: 8c7ded456a0113a9afbcfc9daf0654c20dcbd396b49bdd57d5e7399f89158c1b
font_02_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1