Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b85b31c3031321…

MALICIOUS

PDF

92.9 KB Created: 2021-09-19 01:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9149e88972ddb69672a0bfa9d1682e9d SHA-1: bb6283d5a4af0265212e9843b7ffaa72dbb45a85 SHA-256: e2b85b31c30313218fb3325fc31bad6f0230b5e2cdc96fcdfe983aa5dc009f6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of UTM parameters in some URLs further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=thomas+sowell+discrimination+and+disparities+pdf PDF link annotation
    • http://noospc.ru/SITE/files/editor/file/zunenerewutubumodijipax.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/78374378924.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210912171924.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/zexupekumazo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1f48399a---vetirexoz.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/kugodewulajorezited.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e905abb3a---1487535897.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/80899056505.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/nekeju.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/podurugitup.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/68567468740.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5kkrrlmmqustklgk4dijvov6to/22679054856.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/65442844908.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/44736345364.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/10904636062.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549097f4b1---puxodilaweduzib.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/gerapudif.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457084ee9b8---tojigasuselenujow.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/27712811586.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/39065288010.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/5009762969.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/dabadebugunuli.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_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 10932 bytes
SHA-256: f0d23c482f230a51daf16fd278f16920cb692b7d412ffbf314f20bc3c845e8f2
font_01_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 19536 bytes
SHA-256: da2bd3a433d685340e3a8ebabe9c6ef2769e97eeab7ceb1218104dcef605202f
font_02_sfnt_off00014d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1