Malicious PDF — malware analysis report

Static analysis result for SHA-256 368bcf98c952e540…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 21:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2748574c0bcf4c286a032fee64d66d86 SHA-1: 5689e6d04423e326d7edba552c9ca4ccac5f0464 SHA-256: 368bcf98c952e540dd6e1b8fceaa950ac75eab1c238ce2ca4b20bfcc9087d305
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://obasekiestates.com/UserFiles/file/53510969831.pdf In PDF document text
    • http://ellenia3.eu/userfiles/files/fosiwigonewuwumiw.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/05f20888ee922d73e6a263997ee1b6c7/76621969230.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1d7221a2---76559358442.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/41g8ive85mbep2qgjgcnt7j68p/gavepopoxupurik.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/gewisejudibeba.pdfIn PDF document text
    • http://jar-ted.pl/file/nikumorimebog.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/zerupesilapisuwiladirafe.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160728321c515b---78309185292.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/zamip.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/pegupuxotupatumirewor.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80d2b14f7---65549315845.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/womutaxunigiv.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wamabimatewid.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/kilepunelidix.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c61f1954c99---poxirolasafugebuzena.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/87055929407.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/wedosawen.pdfIn PDF document text
    • https://energooptima.hu/upload/File/21091773083.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/nelezozepenupuxufogosab.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/18021941780.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/ti1bdoi6lg9v1a81dpip0ogbte/9294991748.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2caf0992ec774e9d6cc24d38d198119c/41681299870.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/33964690124.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3a179b732274e6693b3d4c46eca18d15/boroxugogowadiz.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/xawofipojib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+crochet+magic+circle+for+beginnersPDF 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_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 17088 bytes
SHA-256: e8c5c4890e308c8af250ec39069484c20f0b4fce0822f3a399271aa70520ee1c
font_01_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E0 11000 bytes
SHA-256: 1bc2ea5ae62df559a64fae02776f13413c1f9c1de8728d6eee666713bff551b9

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