Malicious PDF — malware analysis report

Static analysis result for SHA-256 889db246ffbf3cd2…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 05:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7e7b4bd332062e21700f712016b7be9 SHA-1: 244c6ecf6a09182a6b0625963499b9dc601168b3 SHA-256: 889db246ffbf3cd2c23cce2ac4b3c4c54e01a09d31bca939f611fbedbb6ea6ea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d7a663911ae3543e3fbea868db0c99b6/vusipikoragekadan.pdf In PDF document text
    • http://www.companyforte.com/imagenes/editor/file/megukipobusuwetebuwozol.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264c7094f---lokalimokesepisabu.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075798f408c1---miwimemasibimim.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b91806d35ed---52611920531.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/i9cc5nknauqmi7mpg5kjgrgge7/97642970427.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gojadalugil.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/bezebibamipitetij.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/minif.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gijunirijuzixosawuduji.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/wazenumakelogorogelofew.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1f7171274bee2ac34fe3bc9a0c30772e/dalupepukifem.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/78090698890.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b892edcfa5e---bomeza.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7dbf15beab8262627adc0632fe0bd7b7/fetekivekukitupinu.pdfIn PDF document text
    • http://proxima-design.cz/files/file/30772291031.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1552a30d356afaedac960efcbaaab37e/mumufudujofumaxetezufawu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/43763593828.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2c152554509875937a36c7a615133640/32294916465.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/xodigon.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/beab03aa86734a49ce7360701701feb7/siroxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=receptionist+questions+and+answers+interviewPDF 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_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 10904 bytes
SHA-256: 446550a977e7a5129eb7a70f088a962c8f6137bc22c93f065f71bec3aab63896
font_01_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C06 17836 bytes
SHA-256: 6524dcd2336cbb456ca0fb5249ef3422da94473345396f77608dd21e17633e3d

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