Malicious PDF — malware analysis report

Static analysis result for SHA-256 750a44dd7eaebee5…

MALICIOUS

PDF

96.1 KB Created: 2021-07-18 02:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fab294e2436ba8102666f13dc918143 SHA-1: 4280ef3f47d5da7a5f05f1c83f7c7e90741211ad SHA-256: 750a44dd7eaebee532604502ac685963721e9fc787ecd0ec2f1360785b97361e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://t-eamplus.de/web/editor/files/18047771192.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086173b117f5---wukurofokig.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/42257975705.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/66216624394.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879783505---piwitekogilumafakitora.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b0925a5a---revoxazogupemoxo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aff99cf23aa768b815b053aeb95f57fb/kewemogopulabu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/96939406631.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/lipidesifogu.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/luwupafuvujozubobutiteja.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf3e80e27---57097799717.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0b74c750---88580229105.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/tupogerixifijabanak.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ipbi6q0ikp81s9ikfebr0sdf69/18045255701.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/lelodemodelunirasino.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/juzapafuparilokulipuzi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b65e566e6232b3d1acc4d6360ceacf64/jufepebejijifasupif.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/pimuguramuzuwefi.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9e2a75d629e679274a95346408ed7c4d/6376613845.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/nefatefoxizijapiridi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b330a345---13248016565.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/teduwurumuzunimi.pdfIn PDF document text
    • http://4bx.pl/public/file/gakufodaninipa.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/ligopobunabexoru.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4877a076---53174387832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=soft+leads+examplesPDF 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_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10540 bytes
SHA-256: 199e5e692d1ac83fd587ab5fb8ad7a0a88e5dfe64169ae6f2134fff49a5ccb34
font_01_sfnt_off00012e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 17100 bytes
SHA-256: d72ce5338676a7a3c64cb7a693160b528a68f8ddda558ba0e07651a916545b8d
font_02_sfnt_off00015b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1