Malicious PDF — malware analysis report

Static analysis result for SHA-256 e487aa9aaa6414ef…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 02:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9ffd93bd4c1857ed23b96dd90ecac84 SHA-1: a99c635de1f7662d0471112ef4ecbeb7d0b288bb SHA-256: e487aa9aaa6414ef76963ce07dd547d1adaf89af1a725c74476e1028d91dbcac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of a 'utm_term' parameter in one of the URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=imo+installing+app PDF link annotation
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/zurudisix.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/xejikudeb.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615002ea0f53c---losonulenedanosuwowugoz.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t578eku2bmpp2ca7d6rdinkut4/46673512576.pdfIn PDF document text
    • http://anpo.vn/upload/files/58137773889.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f81a890710---zuvetigobop.pdfIn PDF document text
    • https://vpmemorial.net/images/file/41002162424.pdfIn PDF document text
    • https://5udua.com/contents/files/89919461886.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147dd11b4669---82654049066.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/232f4e0ce74ddcb985836208fd6366dc/zajisipebuzodego.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/24053599242.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/doxujun.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f36103a97---mumudipilejanutolisejeset.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pimobit.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161398e7bbd586---8638184578.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/zeturofu.pdfIn PDF document text
    • http://ministerium.pt/files/26227003452.pdfIn PDF document text
    • http://learningkey.org/userfiles/62579923139.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/nodozigomodura.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953053485d---rovaxavetedisubenutidib.pdfIn PDF document text
    • https://tekmaker.com/upload/files/sosaxeluvejigibulaxomeku.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nujivunilivoke.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/21698509183.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_off0000ae01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 15540 bytes
SHA-256: db781f8e2243b2c2d01a665a6e9ec0fd2c453d86b7c3e13fb97d652f3056a2bd
font_01_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 10312 bytes
SHA-256: 2167ae6e573d56a70f274756e58d762f9a12b632ce2333cbeb26ce52ede11247
font_02_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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