Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fabb14b5894f79…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 06:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86b14db09846212f509d143d09fa584e SHA-1: e31867869017f3ae366015b8fa92ecf2f97f42fd SHA-256: f7fabb14b5894f79f3339a830efc436ca3ed2200d82fef493b6f959858368bf7
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queure.ru/uplcv?utm_term=o365proplusretail+product+key PDF link annotation
    • https://www.campacinter.com/image/upload/File/pawegubowiruvawuwuvopi.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/boregapoxigo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/72249315782.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/tagugeroregejudaxaleveba.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51166be9f---masevinenasaso.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614baebdaa93a---dufawenimovidabusabemawa.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/48735213706.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/lanerugamaguvofigav.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c7745b8922f7645d827476008527b85c/sedulabopugenodezo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/58271052527.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/fibimobodixiwesojigateti.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69330768197.pdfIn PDF document text
    • http://bubb.cn/up_file/file/23467089048.pdfIn PDF document text
    • http://vkts.se/userfiles/file/mewerogasatugoxelegenolut.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/252230395fa0dfe0b45e1b7d02dd91f2/bomajedule.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/65078107188.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460674c8c30---77262518421.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/lumiziriku.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/fumipajupaf.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/99643251322.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/83998912636.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/tegibupezafalivugemovul.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/wesimitarap.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/34059356616.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/63630818575.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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 17672 bytes
SHA-256: c4112d4183c80eea84dfd200f9249a1a0e3e9f9a7d84fc9d8b855251675a32f5
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 11208 bytes
SHA-256: 3bd857034101f4dbeb2476ea561899660ee026f8692b741de8eaa50d6bc253dd
font_02_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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