Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e06c3515bd5a3…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 02:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52e07fcfcc9acdf40efa99cd3c4e264a SHA-1: 880884ca509f69ab44d0fae4c4ba3e17717706f8 SHA-256: aa0e06c3515bd5a315cda0c42fc8af5861a482a40b377d118e7d9cceb377f714
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final destination and increase the chances of a successful redirection. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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=de+la+codependencia+a+la+libertad+pdf+gratis PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa0de8565---14301981907.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zetefafuz.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/88757630ba7888061b28b8d1fa01bf08/lanisalevegezimebakuxip.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/71130886688.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b747be9aef0---jikusinubenigisis.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/88236866127.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/89827212109.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7352ce1c43---wuvemutuleridebukivekidag.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/lanabibup.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/kawijogarox.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kukadaze.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ea9444a4f4a6b77a5e7cb5b234897778/jutaniw.pdfIn PDF document text
    • https://cape-electronics.com/media/file/934902637.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984ce1e80a1---rasimoguwaza.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/75bb02d5c92f9bfb6c2940ad8f09d5c6/muxifesawixifeligalo.pdfIn PDF document text
    • http://hueide.com/upload/files/wededupi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/fozitesanuzet.pdfIn PDF document text
    • http://i-dron.cz/data/file/8154333280.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/tewonutakemubusutusurojaj.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fezowulifodonefinazusir.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f0447049---72869084667.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e3312a5a---86378181006.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wekitulezudi.pdfIn PDF document text
    • http://thepducphat.com/upload/files/piwomogugigu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608355d7ca80b---69942504444.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4c53c27ece50033921419d7f4482e01e/10757818867.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/294ecbe0f7a5d4283647f084ec0fb1ed/kegotetosuteravogukuja.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_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10936 bytes
SHA-256: a5918e4be700df32f6f8ccb73dcc76d3f097f04d4ccab2e9d2c628aca5ee93a9
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 17996 bytes
SHA-256: 12f3ddb1cefc648424fbabb11f37c98d38faa124ed2d0d6bac6f4024231db3da

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