Malicious PDF — malware analysis report

Static analysis result for SHA-256 e408fd2e68b7db00…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 12:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e15749b1aa8859a890583e4f699dcaa SHA-1: 62bacba9a4823f0d85edc33b1c78231e3cb5f2a7 SHA-256: e408fd2e68b7db00d9170373b4e17b46d40636e8e3a07c7d97045c3e65f11360
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including one identified as compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ankaraeksioglu.com/resimler/files/86458141804.pdf In PDF document text
    • http://szjg.hu/images/file/fibufaxusovun.pdfIn PDF document text
    • http://synergyproperty.com/images/files/25003132790.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/98868830409.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73075829597.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210910111004.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/raselareru.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bonixaluwamonudu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/luau7cs9p7saimi3il9d2beup2/xukaturugoxibapenan.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/womezifafozokobinotediw.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/73945070192.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132b513b6f72---24548745025.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613271a86c9da---nofozaburevopajijegelobu.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/feliganuzutexe.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191746189310.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/hiuh2sulame0p85our361013mj/rilur.pdfIn PDF document text
    • https://ratodua.com/contents/files/pogizuxetaxu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/14484220536.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/lelazezatuketoxamulawus.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/26646801301.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43368279823.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/38115812283.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/22702182939.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/genopas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=d+day+mod+game+downloadPDF 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_off0000c101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC101 16056 bytes
SHA-256: efc4c7fa5dcc768835eda3b8311a7c036d1a2793a5dc470c36058cfc0e1a52cc
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10332 bytes
SHA-256: cf780b312089ec4042832f00c932b33bb545dbd24f4c4179113952f6a65f2301
font_02_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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