Malicious PDF — malware analysis report

Static analysis result for SHA-256 5210abfbbe562658…

MALICIOUS

PDF

83.9 KB Created: 2021-08-17 07:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: bfb628e3efb61946c4411df5b217fe1c SHA-1: ab3f3003e1b0f5abfbe75b729d4218db650905be SHA-256: 5210abfbbe562658c4b6dd7ea76682fb3c39f8c6bfaf55d5d17686d550d2f8be
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites. These sites host further PDF files, indicating a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=biofinity+multifocal+toric+fitting+guide PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41b6ea073---wexatotubobafujimuwoj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fbad41e6d7fbf9c9b807a15519d16f5f/rafizidijejuzav.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fowiwagadepaxaledimamafo.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/85845977490.pdfIn PDF document text
    • http://tdbm.vn/upload/files/tiramugolumumotilerud.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a56ab3924---3682855607.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/rekuzojekawiwib.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b673c0bd2---pewadutoruwape.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6a566db3---17204890254.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/rarovigixikozazajazumu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/54lr5buq9q8ftbre8tfde23kr7/93774348572.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nutezi.pdfIn PDF document text
    • http://greenbrier101.com/userimages/32668693601.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/9d0b7u3mds6da11n8ckj45buql/25723062207.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/59703851598.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3c9b11c53337bbceeab92e78b5d2a644/96474473349.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gv68403hadnffga6h7lmmndqv7/reruxifoken.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/37350810697.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fagukogugoditefop.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/17063622533.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e7e7f147---34504239751.pdfIn PDF document text
    • http://hainfelderteich.at/ruwurenatimevege.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607907dc7c065---88731703678.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 10920 bytes
SHA-256: 127c360e1cefed93a416a3b2429968e4587a672ee84d33405943993af3cbc588
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 18144 bytes
SHA-256: 9342cf5612c3baeb8b59e255b866b3da6e61c4b9dddf34c7614453142b499411

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