Malicious PDF — malware analysis report

Static analysis result for SHA-256 95720de1ef16a2da…

MALICIOUS

PDF

85.6 KB Created: 2021-08-21 10:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ef472d8b79357fb3ea1c572279c3195 SHA-1: c56cea3b5063fcbc480bba3daf2deb7b535cca35 SHA-256: 95720de1ef16a2da4eb15a3a1398a50b7aa7c812d86818a1cef9560e45cea19a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://k-yoga.org/file_upload/spaw_upload/file/20210515193625.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/80737219303.pdf
    • https://jordan.si/dokumenti/file/37841831048.pdf
    • https://hpsoft.shop/upload/files/niravafevixunoparipu.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3f54acbe2eb9aaec375ad7d73342bcbd/7178104038.pdf
    • http://sgpeo.pl/users//file/54847720503.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed7ecd0055---99856183027.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d99a65f5804facf02e0d7b3cbcb318cb/vuxozapinitusebewopa.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qiujkhoilgboeksshdfm01n9sg/roxarilumudizanomolel.pdf
    • https://ev-owners.jp/userfiles//files/borapekurixazelogarebit.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2828b9cd---bezajave.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/mumiwaxil.pdf
    • http://glovimex.com/uploads/ckfinder/files/sogagunipugawovuretidofud.pdf
    • https://warungmimpishio2.com/contents//files/wixulolerag.pdf
    • http://peoplefoster.com/pliki/1234141185.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/danide.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845efa3d9a9---xijitoxafi.pdf
    • http://100gastro.cz/soubory/files/tikosobi.pdf
    • http://dobrejaja.com/Upload/file/sarokatunuzo.pdf
    • http://propellerclubsandiego.org/uploads/files/74141081881.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/majisarawa.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/924cea5b53e3a713dd725780ff53132d/zabedodedase.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vlg4o095dcqdpistmdbk7acenk/97712331937.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdfeb3a2a---zupur.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610ece42625c9---kunutolubekigagugafi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tabla+de+conversiones+de+unidades+del+sistema+metrico+decimal
    • 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_off0000e713.bin
86ef47ca0cf07d8286c970ee519043587391b6b2d8516d79fc1fa6d2085b1601
pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 17984 bytes
font_01_sfnt_off000114de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 16792 bytes
font_02_sfnt_off00012cf5.bin
f4672cec48a86c90ef0034088d77ed1e65b9fd4287a3d10d7307edb9a3c5c80d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 10800 bytes