Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b88c07dc16ff1b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 15:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb8888bbd6fe82e99b5bdb4fa6ce1d2a SHA-1: 7e4551464b39461eb31c7d7243bc7bffa30c6331 SHA-256: e9b88c07dc16ff1b9026fd4325a3aa0524d8f02c43d44e108225299e22221686
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161365428b86e9---fikafofasa.pdf In PDF document text
    • https://kapokcmassage.com/uploads/files/202109031614333432.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/22785817146.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/68075724429.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/8292984359.pdfIn PDF document text
    • https://zhansq.cn/upload/file/karumusizibovemepupiniku.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/tudepifexovi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0dfd4e43---gedufitasisax.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/tofanerumuxaxujevu.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/pezafulegodin.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/39829723367.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a536e18052430c2b2e8a330a90d867bf/54868837266.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/96686845127.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/17417305646.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399adfe7980---67871277112.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/5656055242.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/zixuzigonifafajo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135bce0324a2---fufatokebuti.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/39767321606.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1408256696133e5250f1ba.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/kofemuwumebet.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bututu.pdfIn PDF document text
    • http://infosierra.es/images/editor/zukuve.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/832e0f473270fd156f972c9b311da1f9/renebebaduroxulofub.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/58700956105.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9787c26---2699087049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kiss+daniel+new+albumPDF 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_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 19560 bytes
SHA-256: bd27370d6d2eeb04ad1c3d0d5bf6bb4913e4e97483ba6a0d4eeb8785d26b822b
font_02_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 10408 bytes
SHA-256: d6c87762e4d69d972c9a13a554b32f092b2b9279fa6bd1f48b1b7837e376f3a6