Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a536628c0df94…

MALICIOUS

PDF

91.3 KB Created: 2021-08-15 19:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e239ca21c341ce3eaf0324d18ae7e269 SHA-1: f996cf3fee0afeaff8d5e3778cf7cdb8ebd93b61 SHA-256: 7b3a536628c0df941946811ee9ad58f74171299eab7155b38eac66057df0bdf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://cructi.ru/uplcv?utm_term=exercices+sur+les+adjectifs+qualificatifs+epithete+et+attribut+cm2 PDF link annotation
    • http://travelbilet.ru/sites/default/files/file/ratojapevosabekawoferupo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/67fbe80084b86ca4f2b312d712cced12/puxonotixabolup.pdfIn PDF document text
    • http://land89.com/ckupload/files/lemumokasokozeseguvaxeli.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fovurorekifuka.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608195ed7e5ac---58176188320.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6ekac2rcd7ea7sgbl07lqjfitu/wulafin.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/78336375828.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c923eca4226ebb14eeea43ff494c58e1/xokotiwotidatagafib.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/73794412145.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tigunopuzaxipiligetel.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/35784001030.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/26339876254.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/532b581da2ced46c1ee955c129290796/86360703840.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/dubalomovures.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/bonuzazatak.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27d9263875baaa88a2afd83adb9929b8/powuxuvemezarumite.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e966caef5a33d22386a9dd30b1bb7044/58490444741.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/91037198577.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acad9646d4---92105900146.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/supikiwi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v6725lej9ubmtdomnojech9rb7/96568702285.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/16903035068.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/6304504876.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ab29bfa93b240c6a285a03a839cb48ff/namasasifeg.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_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 11384 bytes
SHA-256: b2a2d498bac5f4bc0c7300853b0c3087e97326cf0ca9f6d76bd668078cf3802a
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 29856 bytes
SHA-256: d8e1024641770c1287f4414e2a7fd074e92d8a50c78dac5b2867d186ed55dd56
font_02_sfnt_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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