Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bfb36863ad21c2…

MALICIOUS

PDF

102.4 KB Created: 2021-07-15 19:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9d2ef718c6290069e120d25e6526629d SHA-1: d987cc19c9ead20375e675424555ef8ca0b488cf SHA-256: c8bfb36863ad21c2e0d5bc23e02c3e4bcc381902f13869b22a23aece639df0f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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 http://jshtextile.com/UserFiles/file///zenenexapubapidowugakadej.pdf In PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/63883127350.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/6753244318.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/85582744883.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/mvuslus3sdvpjcfke4jeu0gi87/xowifabukaboso.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/tewobulixapuwu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/boxinoxorofirixakexek.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/392e7421f73a13f2d3a36064b290434e/wikinipezopigedojifaxazi.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/69210520636.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210626065740.pdfIn PDF document text
    • https://moolans.com/uploads/files/34852621908.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6581d56e06---mugubedasomiranesowoxod.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9ccf0b1d---94083517453.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdr80fbcev5ll6rpg02o6vk65j/66964144779.pdfIn PDF document text
    • http://techbis.pl/files/file/videnopofof.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e9018bf8---raxulajire.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210617142919.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910e6da53a1---dizexegupewili.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/33iarjuhod7lo764u8u1588hbb/78950111209.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/tikewevinexoluzupejel.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/22132641016.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/sepazorosofaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nice+words+to+describe+someone+that+start+with+rPDF 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_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 10792 bytes
SHA-256: 95f84c54fe3bb8aaae62e35f60d9014c58b4e4f37d60a50b1d922a921a4710f7
font_01_sfnt_off00014356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B68 17984 bytes
SHA-256: 338cda80b28c5e424ff87690c37d011e0c7e19cc4ca7fc579fe04bab436afbcc

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