Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f3902fc8fd1707…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 20:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d965eeddb0f95b0b6444b65777476d03 SHA-1: 2def8c1fb8e0440d3a7045a339c0f21c3b243a7a SHA-256: e3f3902fc8fd1707fffa75213094509cddcffa708d48d77ad742258237c40eef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and ML classifiers, with heuristics indicating embedded JavaScript and a link farm pointing to compromised websites. The numerous external URLs suggest an attempt to redirect users to potentially malicious sites for phishing or further payload delivery. The PDF structure and embedded content are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://smidgel.ru/uplcv?utm_term=understanding+human+sexuality+hyde+pdf PDF link annotation
    • http://gpszone.hu/upload/userfiles/file/69277084640.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145461dc543a---39868816580.pdfIn PDF document text
    • https://coluer.ir/documents/file/jaditizetori.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/44196951366.pdfIn PDF document text
    • https://esvigo.com/upload/files/zeduxutefawabidu.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/80086490016.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/tinebam.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/53456677299.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/telufazeri.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/jisakigekizinuv.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/89605853983.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109130252008349.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/kegefewemazusab.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d39681d---70523046442.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d481e101---43109226077.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144fe5b01481---pufenovirizej.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136326ac25a6---nuzetamev.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/781775759.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tudubevedegowet.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/97234638257.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/41598434627.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/48372884576.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/sirokufa.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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11148 bytes
SHA-256: b58df6a7e3031cfc06a298edfe9c1f21575030e813452f77851f1ccee6c937d3
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 18744 bytes
SHA-256: 386a228f88ecb6ad9dc2b3b4ee27abb882cabbd1a9e77e7a5cef29d380472b20

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