Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca91cd322e56786…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 16:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bf2ecae030eb937c574b7749942c0f4 SHA-1: 0df82ace9f859203157c4c838e755053710ba424 SHA-256: 9ca91cd322e567865f909375ed661a2936028b1063744b796c2e240559230a72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://synerhu.ru/uplcv?utm_term=least+square+estimation+pdf PDF link annotation
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/k6572pkpjpe04bgprt3qhruirm/57896713899.pdfIn PDF document text
    • http://imi.vc/upload/files/zagupiwajowobaxozukaku.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/kogavadeledorizumonud.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210816002457.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c2d7fe3b0160fcd64a4c7f63fd2565b1/2988038730.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6d69c348---14563013891.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16111c25d4279d---xapalokaviwasejegizezonuf.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sosugufimesifutofibuwim.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/gemoxanifaxuzegaraxovo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134fce7424a4---99364620724.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a9a0c0909291b9f6f84c8e40f44a7488/gumofemexurirola.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/45449328763.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/88683703948.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/13329897076.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/97326043249.pdfIn PDF document text
    • http://teplospectr.ru/images/files/88215605959.pdfIn PDF document text
    • http://soc-in.com/data/media/files/31824679250.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/pedifolipisananuwusamedo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/002ba9u9gufckhf0vijg7tkhba/16770742069.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/dufaxojeredovokow.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/2812116644.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/23243104845.pdfIn PDF document text
    • 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_off0000bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 15652 bytes
SHA-256: 2d641ad0665d00d1f3dc0c3858cd890c08c6a561c80654725ba28092a8917245
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 10816 bytes
SHA-256: 890b96173a97b292be1b0eb0bc13e8a432001cc761288b01aab3d5c326adcdee
font_02_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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