Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e8f3bc84b7c3d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 09:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97a5213a493166200fd25a555dbb7ed4 SHA-1: fe303a01c9eb9c2e10c1bd88f51a7b65fae95ce5 SHA-256: ab4e8f3bc84b7c3d2c57e7a8528bc96a2c8ffd4bbbed0d413b6d605b6f493ae4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of embedded JavaScript suggests potential for client-side attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://okun.su/upload/file/74218985264.pdf In PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_061450_119.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/nojasisisaziw.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/42740115758.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384ff7a67b3---suxegiwilaso.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2ce3c2f9c5e44452123db072ae686f89/jawidivati.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kifemaredefaminawija.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/potodetijexubebevenirem.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/disadereredijodew.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/bazumeduledavuninag.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/54061299268.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/xiwolaxuda.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/79613774895.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/74375602401.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396f0682545---nigewojixujabisepe.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/88615440935.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/81572802767.pdfIn PDF document text
    • https://iwistw.com/upload/files/fasexapaminonu.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zologopumovosopu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/netujoboxafunadepo.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rigunejatasiziluxil.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/tidoregogekozodo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135907143acc---gisex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=oreo+tv+download+for+pcPDF 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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 10532 bytes
SHA-256: a34a8c3deb3a7a99048149e8bea36976a9304e76d9ac984332d77ba8c553ba76
font_01_sfnt_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 16324 bytes
SHA-256: 23173415f5e6fae56f14c7529a6ae165d18c887e2dd39acf9c58e174c6d4de38
font_02_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.