Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f6a12ded29f850…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 06:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4eae43003a99f6c512864fdff91855fa SHA-1: 71b3d203de7c722cab2dab1515d822a62a01cc2a SHA-256: e3f6a12ded29f850b28a090da171b9123a25cf574fb14fd4433e0c219900bd32
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a password-protected archive lure. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to deliver a secondary payload. The presence of JavaScript indicates potential execution of malicious code, likely to facilitate the download or execution of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=lock+icon+android PDF link annotation
    • https://solelane.com/ckfinder/userfiles/files/tajaga.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/71680941768.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/pefelefes.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/11719544816.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/fijudakagow.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/82486543740.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613372d78062b---76297865052.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/toferuxe.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/83964632936.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366be0ab9cb---77696553706.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/66120437909.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/54307073652.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/noxobej.pdfIn PDF document text
    • https://riwg.in/userfiles/file/mulazikemevotu.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/3071076765.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210911194750_1769774027.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/jamowezememu.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bijukedakixujomefaluwu.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/7710867335.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb92babda---89786806718.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912180602354829.pdfIn PDF document text
    • http://nessium.net/userfiles/file/29975269608.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/9205858251.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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 9968 bytes
SHA-256: 8d2346bb278ef9fb1c09588964ec6d88eca1a84f3b6423b88b4e87680477d39a
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 18620 bytes
SHA-256: ab2a9d8e27fce716dae7653f2de8ee7475aab80b703d4f8428e4754f71dc7738
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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