Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4109e48e41af5fc…

MALICIOUS

PDF

91.2 KB Created: 2021-07-26 04:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f20c6d4d84398a874730ea9833a2a5e5 SHA-1: 47151e9e1e8c7bd9641411f0f7c7cb25e5e8b15f SHA-256: f4109e48e41af5fca889bfb2d47455e3dba719c85acd8adb63e3888c604e59b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/paxanajelajemujavexu.pdf
    • http://geredekombiservisi.com/userfiles/file/togafibomis.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094043385c79---pozimaxanapigupixu.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ca5ce617---91001862662.pdf
    • http://antichigelsi.it/userfiles/files/fometuwesipivabogipipan.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/pomafinatatupexeliwo.pdf
    • http://lagostena.it/userfiles/files/42285208476.pdf
    • http://www.prieteniitehnicii.ro/documente/file/punanofatogotolawajado.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebbdcaf1e---sedogewanut.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fc638b1d---94099679494.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814a8230cc1---54391643464.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdf
    • https://tecnicadovolante.com/images/file/venikoj.pdf
    • http://pwr-tech.ru/userfiles/file/89872765116.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/knisgq7dout444mg0s493sat85/misegawited.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210614205311.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/nuzunapiketejubaze.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3b85fa---33520769473.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3814d32f1---23945809760.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3937933f11---bubexatetidi.pdf
    • http://aarogyamedico.com/userfiles/file/89759106008.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f2c5f31eed8953e057e77148afb4c657/gegubokejog.pdf
    • https://angelsstaff.com/uploads/file/xuwanogulafanunuwifex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=androeed.ru+among+us+hack
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ed7d.bin
9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED7D 16244 bytes
font_00_sfnt_off0000d56c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 16792 bytes
font_02_sfnt_off00010364.bin
f397f1cc48c838bb6b1c1895b05381b49e2f4f34ce65096ec76f306101800fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 1684 bytes
font_03_sfnt_off00010b64.bin
448b4080ffe9af7160c47a4329ea1e0b5468e6c5e10aea9cacfb6ff970b56413
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 22404 bytes
font_04_sfnt_off00014300.bin
0faec4145cf3582829b8bc608d059539231a000a27808c50ffc702e373e720cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14300 10820 bytes