Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25270b4c525ee66…

MALICIOUS

PDF

134.0 KB Created: 2021-09-07 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9afaadf1eed7fc66802e824b0a7901b1 SHA-1: 2ab315797cbb15aca06b4cded0b6831e34d6e2ef SHA-256: b25270b4c525ee669e3714b61b41e6fd046159359c484c4a60c152a0961d28ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=le+poesie+di+alda+merini+pdf PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4b560780e36ef3a089c18aac62de1b1c/33043759211.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60bd56aee413a.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/34c932928596ebb136103b01d19d3f09/7677128383.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/detalunilokapejevizi.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/25433543280.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/81615776644.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/zufimokafibe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b904f6ebf4---vetumobepofi.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/jazepadopulomowifuma.pdfIn PDF document text
    • https://soechi.net/userfiles/file/16517823614.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/52187031418.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/42829637371.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/upopc7inf2nu1q2o4b9eekrbli/xofipivutapowa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb49511fdd---denonusepij.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/90911747124.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/44350f6666bc8701ac9368e82efd3df0/66979804878.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/2437672942.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/tulipekunufiwexekasob.pdfIn PDF document text
    • http://strandedtattoo.net/file/vorupivimixijaro.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/46574147720.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/nezekonetino.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09f74809b---28893848612.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f0978893ae7---nizokeronin.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_off0001a4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4BF 19384 bytes
SHA-256: 726b6584b4e943d0d29cd7715284a5ed0e300a6e4209d7fd954d4d3e8d520f6d
font_01_sfnt_off0001d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D844 10516 bytes
SHA-256: 14a8c6d2c65572d0595d5f7e4ed4c6414b0d785bfb0619007c9d6f9e42a6ad8c
font_02_sfnt_off0001f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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